United States Patent 3,714,226: Scope, Claims, and Landscape for the Claimed Benzoic Acids

US Patent 3,714,226 claims a family of 2-hydroxy-5-aryl benzoic acids (and related R2-substituted analogs), with explicit examples that include mono-fluoro and difluoro aryl variants, plus acetyl/acetoxy substitution and a specific choline salt embodiment. The enforceable scope is defined by (i) a core substitution pattern on the benzoic acid ring and (ii) an aryl scope on the 5-position with specific halogen patterns disclosed in the claim set you provided.

What is the claim structure in US 3,714,226?

1) Which compounds define the core claim family?

Based on the claim text provided, the independent and dependent claims cover:

Claim 1 and Claim 2: “A compound of the formula …” (general structural claims, formula not fully rendered in your excerpt).
Claims 3 to 6: Specific 2-hydroxy-5-(fluorophenyl/difluorophenyl)benzoic acids where the aryl ring substitution position and fluorination pattern are defined.
Claims 7 to 10: A second general set where R2 is hydrogen or acetyl, and where specific embodiments are then narrowed to:
- 2-hydroxy-5-(4''-fluorophenyl)benzoic acid (Claim 8)
- 2-acetoxy-5-(4''-fluorophenyl)benzoic acid (Claim 9)
- choline salt of the acid when R2 is hydrogen (Claim 10)

2) Which variables control literal coverage?

From the claims as provided, the literal coverage hinges on at least two structural control points:

Benzoic acid scaffold substitution
- A 2-hydroxy (or 2-acetoxy) group.
- A 5-aryl substitution.
Aryl ring at the 5-position
- The aryl is a fluorophenyl or difluorophenyl with defined positions:
  - 2''-fluoro, 3''-fluoro, 4''-fluoro
  - 2'',4''-difluoro
R2 substituent
- R2 is hydrogen or acetyl (Claim 7).
- Claim 9 demonstrates the functional translation: acetyl on the relevant oxygen becomes acetoxy on the benzoic acid.

Claim-by-claim scope (as provided)

Claims 3–6: Explicit 2-hydroxy-5-(fluoro/difluoroaryl) benzoic acids

These claims narrow to specific aryl substitution patterns while maintaining a 2-hydroxy benzoic acid core.

Claim	Benzoic acid core	Aryl substituent at 5-position	Literal structure (from provided text)
3	2-hydroxy-benzoic acid	pentafluorophenyl	2-hydroxy-5-(pentafluorophenyl) benzoic acid
4	2-hydroxy-benzoic acid	2''-fluorophenyl	2-hydroxy-5-(2''-fluorophenyl)-benzoic acid
5	2-hydroxy-benzoic acid	3''-fluorophenyl	2-hydroxy-5-(3''-fluorophenyl)-benzoic acid
6	2-hydroxy-benzoic acid	2'',4''-difluorophenyl	2-hydroxy-5-(2'',4''-difluorophenyl)-benzoic acid

Practical implication: These dependent claims are strong anchors for literal infringement because the aryl substitution positions are stated in the claim language you provided. A product matching any of these named structures falls within those dependent claims (subject to validity and enforceability).

Claims 7–10: R2 = hydrogen or acetyl; salts included

Claim 7 introduces the most important “scope lever” beyond aryl substitution: R2.

Claim	Scope lever	Constrained embodiment (from provided text)
7	R2 is hydrogen or acetyl and includes “pharmaceutically acceptable non-toxic salt”	General R2-scoped compound or non-toxic salt
8	R2 hydrogen	2-hydroxy-5-(4''-fluorophenyl)benzoic acid
9	R2 acetyl	2-acetoxy-5-(4''-fluorophenyl)benzoic acid
10	R2 hydrogen and salt specificity	choline salt of the acid

Practical implication: The claim set covers both free acids (R2 = hydrogen, where the scaffold includes 2-hydroxy) and a protected/functional analog represented by acetoxy (Claim 9, tied to R2 = acetyl). It also captures a specific salt form (choline salt) for the R2 = hydrogen acid (Claim 10).

How broad are Claims 1–2 relative to dependent claims?

Are Claims 3–10 the real “scope”?

Claims 3–6 and 8–10 are explicitly limited to enumerated aryl and substitution patterns. Claims 1–2, described only as “a compound of the formula,” likely set the broader structural boundary that those embodiments instantiate.

Given only the partial formula rendering in the prompt, the enforceable practical boundary can still be inferred:

Claims 3–6 define a subset with 2-hydroxy and aryl rings that have fluorine substitutions at specific positions, including pentafluorophenyl.
Claims 7–10 introduce R2 variation and salt coverage.

So the “real” coverage likely divides into:

Core scaffold claims (Claims 1–2) using the unspecified general formula
Known exemplars / narrower dependent claims (Claims 3–6, 8–10)

From an infringement and freedom-to-operate perspective, dependent claims matter most because they remove ambiguity in essential substitutions. Independent formula claims matter most when a product is near but not exactly on one of the enumerated examples; then the question becomes whether the product still satisfies the independent formula boundaries.

Patent landscape implications (based on the claim content you provided)

What competitors/design-arounds are suggested by the claim language?

Based on the explicit substitution patterns in the claims, the design-around pressure points are:

Aryl fluorination pattern
- The disclosed dependent claims name:
  - pentafluorophenyl
  - 2''-, 3''-, 4''-fluorophenyl
  - 2'',4''-difluorophenyl
- A likely strategy to reduce literal risk is to use aryl substitutions outside these enumerations while still fitting the general formula of Claims 1–2 (if that general formula is broader than the dependent claims).
2-position functionalization: hydroxy vs acetoxy
- Claim 7 limits R2 to hydrogen or acetyl.
- Claim 9 explicitly shows acetoxy.
- A likely strategy is to avoid the specific R2 outcomes (e.g., not having the acetyl/acetoxy relationship). If R2 is defined in the formula such that other protecting groups would not satisfy, that reduces literal risk.
Salt form
- Claim 10 explicitly claims the choline salt.
- A likely strategy is to use a different acceptable salt (if the salt clause is only for “choline salt” explicitly in a dependent claim, but the broader salt language exists in Claim 7).

How would a product land in the claim set?

For a therapeutic candidate whose structure resembles these acids:

If it has 2-hydroxy (or equivalent that meets the formula) and a 5-(2''-fluorophenyl), 5-(3''-fluorophenyl), 5-(4''-fluorophenyl), 5-(2'',4''-difluorophenyl), or 5-(pentafluorophenyl) pattern, it maps directly to dependent claims.
If it has the 2-acetoxy variant with 4''-fluorophenyl, it maps to Claim 9.
If it is the choline salt of the R2 = hydrogen acid, it maps to Claim 10.

Enforcement-relevant interpretation points from the claim set

Salt and “R2” language increases coverage surface

Claim 7 includes both:

a free compound concept parameterized by R2, and
“pharmaceutically acceptable non-toxic salt thereof.”

That breadth matters because it can capture commercial salt selection beyond the single explicitly named choline salt in Claim 10. Even if Claim 10 nails down choline as a specific embodiment, Claim 7’s non-toxic salt clause can extend coverage for other salts if the independent formula and R2 scope are satisfied.

Dependent claim enumeration tightens literal infringement

Claims 3–6 and 8–10 explicitly recite substitution identity. That reduces argument surface on whether a given fluorophenyl is “close enough.” Literal infringement analysis becomes essentially a match test for substitution position and substitution count on the aryl ring.

Freedom-to-operate framing: what matters for validity and scope battles

Core scope targets likely drive obviousness and enablement scrutiny

Even without the full specification text, the claim set indicates a chemistry area where patents typically face:

Obviousness challenges based on known halogenated aromatic acid scaffolds
Obviousness challenges to substitution pattern selection (2''-, 3''-, 4''-fluoro and difluoro combinations)
Salt form obviousness for common pharmaceutically acceptable cations such as choline

Your claim set contains both:

explicit enumerated substitution variants, and
a specific salt embodiment (choline).

In litigation, these features often become the focal points for prior art mapping and for argument that the claimed variants were either routine optimization or were not taught.

Key Takeaways

The claim set covers a defined benzoic acid scaffold with a 2-hydroxy or 2-acetoxy relationship (via R2 = hydrogen or acetyl) and a 5-aryl fluorinated pattern.
Dependent claims provide strong literal anchors for at least these aryl variants: pentafluorophenyl, 2''-fluoro, 3''-fluoro, 2'',4''-difluoro, and 4''-fluoro.
Salt coverage is built into Claim 7, while choline salt is explicitly claimed in Claim 10, increasing practical infringement risk for that specific salt.
Design-around pressure concentrates on (i) aryl fluorination pattern outside the enumerated dependent examples, (ii) avoiding the specific R2 = hydrogen/acetyl embodiments, and (iii) avoiding choline salt if product strategy centers on salts.

FAQs

1) Which specific compounds in the claim set are explicitly enumerated?

Claims 3–6 and 8–10 explicitly enumerate:

2-hydroxy-5-(pentafluorophenyl) benzoic acid
2-hydroxy-5-(2''-fluorophenyl)-benzoic acid
2-hydroxy-5-(3''-fluorophenyl)-benzoic acid
2-hydroxy-5-(2'',4''-difluorophenyl)-benzoic acid
2-hydroxy-5-(4''-fluorophenyl)benzoic acid
2-acetoxy-5-(4''-fluorophenyl)benzoic acid
choline salt of the 2-hydroxy-5-(4''-fluorophenyl)benzoic acid (as the R2 = hydrogen salt in your provided text)

2) Does the patent claim salts broadly or only choline?

Claim 7 includes “pharmaceutically acceptable non-toxic salt thereof.” Claim 10 explicitly names the choline salt as an embodiment when R2 is hydrogen.

3) What does R2 = acetyl mean in the context of the dependent claims?

Your dependent claim text shows the acetyl form corresponds to 2-acetoxy (Claim 9), using the same aryl identity as the related hydroxy variant (Claim 8).

4) If a product uses a 4''-fluorophenyl aryl group, is it automatically within the patent?

If it also matches the rest of the scaffold (including the R2 relationship and the 2-position functional group per the formula) it maps into the dependent claims. Claim 8 covers the 2-hydroxy form with 4''-fluorophenyl; Claim 9 covers the 2-acetoxy form with 4''-fluorophenyl; Claim 10 covers the choline salt of the R2 = hydrogen acid.

5) What is the most direct infringement trigger from the provided claim text?

A product that is one of the explicitly named acids or salts listed in Claims 3–6 and 8–10 is the most direct trigger because those substitutions and positions are stated in the claims.

References

[1] United States Patent 3,714,226. (Claims provided in prompt text).

Details for Patent: 3,714,226

Summary for Patent: 3,714,226