Executive summary: US Patent 5,703,017 claims a broad chemical genus covering substituted 3-(hetero)arylcarboxylic acids (and related derivatives) defined by Formula I, with wide latitude in substituent classes on the aromatic/heteroaromatic rings and multiple optional functional groups (including halogenated and alkoxy/alkylthio patterns), plus a connected set of dependent claim scope refinements and process claims to assemble the core via epoxide opening and pyrimidyl/triazinyl coupling (and a sulfur analogue). The estate is structurally broad but likely function-limited in practice because the claims are tied to the specific scaffold and parameterized substituent sets, while commercial freedom for herbicide/pesticide uses depends on whether later patents cover specific exemplars, crystalline forms, salts/prodrugs, or formulations.
US Patent 5,703,017 scope and claims: what compounds are covered by Formula I?
Answer: The core coverage is a 3-(het)arylcarboxylic acid derivative defined by Formula I, with substituent variables that span (i) acid-side functionalization (R), (ii) ring substitution patterns (R2, R3, R4), (iii) heteroatom-containing linker/systems (X, Y, Z), and (iv) a second substituent set (R5, R6) with an explicit proviso that removes some overlap in specific “unsubstituted phenyl” edge cases.
Claim 1 structural elements (Formula I) and what each variable effectively means
Claim 1 is a genus claim. In freedom-to-operate terms, infringement analysis typically turns on whether an accused structure matches the scaffold and the variable ranges without hitting any provisos.
A. Acid derivative / electrophile precursor options (R)
Claim 1 defines R as:
- formyl, or
- CO2H, or
- a radical hydrolyzable to COOH.
Practical implication: R covers free acid and prodrug-like hydrolyzable derivatives, which can matter for both infringement (salt/prodrug embodiments) and regulatory classification (metabolite/active form theories).
B. Heteroaromatic position / nitrogen-linked handle (X)
Claim 1 defines X as nitrogen or CR14 (carbon bearing H or forming a chain with R3).
This variable introduces two alternative link architectures:
- X = N gives a nitrogen in the ring system or scaffold position.
- X = CR14 allows R14 = H or a chain that, together with R3, forms a 3- or 4-membered alkylene/alkenylene chain with O-substitution in the methylene positions.
- Alternatively, R3 can link to R14 to form a 5- or 6-membered ring.
Practical implication: Claim 1 includes fused or ring-transposed variants where the scaffold can incorporate oxygen-substituted linkages, expanding the genus beyond a single aromatic substitution pattern.
C. Substituent set for R2 (electronic and steric tuning)
R2 is selected from:
- halogen,
- C1–C4 alkyl,
- C1–C4 haloalkyl,
- C1–C4 alkoxy,
- C1–C4 haloalkoxy,
- C1–C4 alkylthio.
Practical implication: This is a standard medicinal chemistry “substituent compatibility” bucket covering typical herbicide optimization vectors.
D. Substituent set for R3 and its ring-forming capability
R3 is:
- halogen,
- C1–C4 alkyl,
- C1–C4 haloalkyl,
- C1–C4 alkoxy,
- C1–C4 haloalkoxy,
- C1–C4 alkylthio,
or R3 links to R14 as described to form a 5- or 6-membered ring.
E. Aromatic “cap” system (R4)
R4 is phenyl or naphthyl, optionally substituted by 1 to 3 of:
- halogen, nitro, cyano, hydroxyl, mercapto, amino,
- C1–C4 alkyl, haloalkyl, alkoxy, haloalkoxy, alkylthio,
- alkylamino and dialkylamino (C1–C4),
- alkylcarbonyl and alkoxycarbonyl (C1–C4).
Practical implication: Claim 1 allows multiple functional groups that often drive activity and environmental profile of herbicides.
F. Additional heteroaromatic option (R5)
R5 is:
- H,
- C1–C4 alkyl,
- C3–C6 alkenyl,
- C3–C6 alkynyl,
- C3–C8 cycloalkyl,
- C1–C4 haloalkyl,
- C1–C4 alkoxyalkyl,
- C1–C4 alkylthioalkyl,
- or phenyl.
G. Side-chain / terminal substituent volume (R6)
R6 is:
- C1–C8 alkyl,
- C3–C6 alkenyl,
- C3–C6 alkynyl,
- or C3–C8 cycloalkyl,
with further substitution on those groups by halogen/nitro/cyano/alkoxy/alkenyloxy/alkynyloxy/alkylthio/haloalkoxy/alkylcarbonyl/alkoxycarbonyl/alkylamino/di-alkylamino/phenyl or phenoxy (phenyl may be mono- to polysubstituted).
H. Linker/heteroatom identity (Y and Z)
- Y is sulfur or oxygen or a single bond.
- Z is sulfur or oxygen.
Claim 1 proviso that narrows a specific overlap
The final proviso:
- R6 is not unsubstituted C1–C4 alkyl when R4 is unsubstituted phenyl, and simultaneously Z is oxygen and R5 is methyl or hydrogen.
Practical implication: This is the kind of edge-case limiter that can preserve design-around freedom for specific “simple” analogs. For infringement, the proviso becomes a carve-out only when the whole constellation matches.
Which dependent claims narrow 5,703,017 to specific R groups and derivatives?
Answer: Dependent claims 2 to 6 carve the genus by restricting R and certain scaffold parameters, including salts/counterions and additional ring systems, while maintaining the overall Formula I framework.
Claim 2: expanded “R” substituent classes (prodrugs/salts/charged forms and special substituents)
Claim 2 states R is a specific group (R-form variety). It enumerates multiple categories:
- Hydrogen
- Succinylimidoxy group
- 5-membered heteroaromatic via nitrogen (1–2 halogens and/or C1–C4 substituted hetero-compatible groups)
- Another radical involving m = 0 or 1 and substituent-rich heterocyclic/alkyl constructs with up to multiple halogens and functional groups
- Another radical where R9 is alkyl or substituted phenyl, with p = 1–4 and k = 0–2
- OR10 where R10 covers:
- cations: alkali metal, alkaline earth (one equivalent), ammonium, organic ammonium
- cycloalkyl with alkyl substitution
- substituted C1–C8 alkyl groups with halogen and functional substituents (alkoxy, alkylthio, cyano, carbonyl/alkoxycarbonyl, aromatic phenyl/phenoxy and substituted variants)
- more specialized C1–C8 alkyl variants with heteroaromatic attachments
- C2–C6 alkyl with oxime/oxyimino substituents in the 2-position
- C3–C6 alkenyl/alkynyl groups with halogens
- substituted phenyl groups
- a further radical where R11/R12 are alkyl/alkenyl/alkynyl/cycloalkyl (optionally substituted) or phenyl, or together form a C3–C12 alkylene chain with up to three C1–C4 alkyl groups
- Or R forms another radical defined by R13 (alkyl/alkenyl/alkynyl/cycloalkyl or substituted phenyl).
Practical implication: Claim 2 makes explicit coverage for salts and charged forms and multiple ester/prodrug-like “R” options, reducing the ability to avoid coverage simply by using a particular salt form.
Claim 3 and 4: lock R4 = phenyl and set specific linker constraints
- Claim 3: R4 is phenyl (substituted as in Claim 1), remaining parameters as in Claim 1.
- Claim 4: Z is oxygen, R4 is phenyl, R5 is methyl, X is CH, R2 and R3 are each methoxy, and Y, R1, R6 follow Claim 1.
Practical implication: Claim 4 is a narrower embodiment with a recognizable “pattern lock” (methoxy/methyl/O oxygen). It is a better target for evaluating alleged infringement because accused products are less likely to match all fixed parameters by coincidence.
Claims 5 and 6: R4 = heteroaromatic; Z = oxygen with methoxy constraints
- Claim 5: R4 is a five- or six-membered heteroaromatic structure; rest as in Claim 1.
- Claim 6: Z is oxygen, R4 is heteroaromatic, R5 is methyl, X is CH, R2 and R3 are methoxy.
What product types are claimed: herbicides, growth regulators, and methods of use?
Answer: The patent includes both chemical product claims and formulation/use claims.
Claim 7: herbicide composition
A herbicide containing the formula I compound plus conventional inert additives.
Scope note: This is a typical composition claim, but if later patents cover particular formulations (adjuvants, controlled release), Claim 7 may still face practical competitive limitations.
Claims 8 to 10: methods
- Claim 8: controlling undesirable plant growth via herbicidal amount acting on plants or habitat.
- Claim 9: agent influencing plant growth.
- Claim 10: regulating plant growth via bioregulatory amount.
Practical implication: Method claims can remain relevant even if specific compositions are not practiced, subject to proof of actuation and dosage.
What process claims exist for making these compounds?
Answer: The patent has at least two process pathways: an epoxide reaction and a pyrimidyl/triazinyl derivative coupling, plus a sulfur analogue pathway.
Claim 11: narrower Formula VI subclass
Claim 11 recites Formula VI with constraints:
- R, R4, R5, R6, Z same meanings as Claim 1,
- proviso: same edge-case carve-out as in Claim 1 (R6 not unsubstituted alkyl when R4 is unsubstituted phenyl or 4-isobutylphenyl),
- Z is oxygen and R5 is simultaneously methyl or hydrogen.
Claim 12: epoxide of Formula IV + compound of Formula V
Process:
- epoxide (Formula IV) reacted with compound R6–ZH (Formula V) in inert solvent or with catalyst.
Key constraints: the same proviso about R6 vs R4 and Z oxygen and R5 methyl/hydrogen.
Practical implication: This process claim can create IP barriers to contract synthesis even when the final product is sold by others, provided the accused process practices the defined steps and conditions.
Claim 13: Formula VI (Z=O) + pyrimidyl/triazinyl derivative
- react Formula VI (oxygen) with pyrimidyl/triazinyl derivative of Formula VII in inert solvent with base.
- R15 is halogen, and R16 is sulfonyl/alkyl/haloalkyl/phenyl as defined.
Claim 14: Z=O sulfur analogue pathway
- react Formula VIII (based on Claim 12 substituents) with pyrimidyl/triazinylthiol of Formula IX.
How broad is the claim estate coverage: “genus size” and real-world infringement risk
Answer: The claim language is broad in substitution classes, but bounded by:
- the fixed scaffold relationship between variables (Formula I),
- the permitted heteroatom assignments (X, Y, Z),
- and the specific proviso excluding a limited subset of “simple” R6/R4/Z/R5 combinations.
Infringement risk mechanics:
- High risk for accused structures that match fixed “pattern locks” in dependent claims, especially Claim 4 and Claim 6 where X=CH, R5=methyl, R2=R3=methoxy, Z=oxygen.
- Medium risk for broad genera products if they still share the scaffold and match substituent ranges (halogens, methoxy, alkylthio etc.).
- Lower risk for salts/prodrugs because Claim 2 expands R to include salts/cations and ester/prodrug-type groups.
What would a competitor need to design around within this patent’s scope?
Answer: The highest-leverage design-around vectors are those that avoid matching the scaffold parameterization while staying in adjacent chemistry space.
1) Flip the heteroatom identities (Y or Z)
Because dependent claims lock Z=oxygen, accused compounds with Z=sulfur can avoid those narrower claims while potentially still implicating Claim 1 depending on whether sulfur is allowed in the accused scaffold.
2) Avoid the methoxy/methyl/X=CH pattern
If a commercial analogue has different substitution at the positions mapped to R2, R3, R5, X, it may fall outside Claim 4/6 even if it stays within the Claim 1 genus.
3) Use edge-case carve-out logic (the R6 proviso)
The proviso is narrow, but if an analogue matches:
- R4 = unsubstituted phenyl (or 4-isobutylphenyl for Claim 11),
- Z = oxygen,
- R5 = methyl or hydrogen,
then it must avoid having R6 be an unsubstituted C1–C4 alkyl.
What is the patent landscape for US 5,703,017 in the U.S.?
Answer: A complete landscape requires Orange Book listings and patent family data (continuations, related filings, and later improvements). That data is not present in the supplied text, so no defensible set of “which companies own/contend” entries can be produced here.
Does this patent have Orange Book status or FDA listing relevance?
Answer: Not determinable from the claim text alone. Without the drug name, FDA NDA/ANDA reference, or Orange Book listing identifiers, no accurate Orange Book status can be stated.
Key Takeaways
- US 5,703,017 is a genus chemical patent covering 3-(hetero)arylcarboxylic acid derivatives under Formula I, with broad substituent allowances for halogen, alkyl, alkoxy, haloalkyl, alkylthio, and functional group-rich aromatic rings.
- Dependent claims 2–6 narrow coverage by specifying expanded R definitions (including salts/cations and multiple prodrug-like options) and fixing parameter combinations such as Z=oxygen, R5=methyl, X=CH, and R2=R3=methoxy.
- The patent includes composition (herbicide) and method-of-use claims (control/regulation of plant growth), plus process claims using an epoxide coupling route and pyrimidyl/triazinyl derivative coupling.
- The most actionable scope pinch points for infringement and design-around are the heteroatom/linker variables (Y, Z, X), the methoxy/methyl fixed substituent patterns in Claims 4 and 6, and the R6 proviso tied to unsubstituted phenyl and oxygen.
FAQs
- How do the R and R6 provisos limit otherwise broad Formula I coverage?
- Which dependent claims provide the most pattern-specific infringement targets (Claim 4 vs Claim 6)?
- Do the inclusion of cations and ester/prodrug-like R groups (Claim 2) expand infringement beyond free-acid products?
- What manufacturing/IP risk comes from the epoxide-to-Formula-V process claim (Claim 12)?
- How do the herbicide composition and method-of-use claims affect enforcement even if a product is sold without explicit labeling?
References
- United States Patent 5,703,017, claims 1-14 (as provided in prompt).
