Analysis of US Patent 5,767,082: Scope, Claims, and Patent Landscape
Summary
United States Patent 5,767,082 (hereafter, ‘‘the ‘082 patent’’), granted in 1998, relates to a novel chemical composition and its application in pharmaceutical formulations. Specifically, it covers inventive compounds with therapeutic relevance, detailing claims that define the scope of protection primarily focused on a particular class of drug molecules and their formulations. This analysis evaluates the patent's scope and claims, examines its position within the broader patent landscape, and explores its implications for industry stakeholders.
What is the Scope of US Patent 5,767,082?
Patent Classification and Technical Area
| Class |
Subclass |
Description |
| 514 |
286 |
Organic compounds, especially heterocyclic systems with pharmaceutical utility. |
| 514 |
263 |
Drug combinations; formulations. |
- Key International Patent Classifications (IPC):
| IPC |
Description |
| A61K |
Preparations for Medical, Dental, or Toilet Purposes |
| C07D |
Heterocyclic compounds (pharmacologically active) |
Technical domain:
The patent encompasses heterocyclic compounds with specified chemical structures designed for medicinal purposes—primarily, inhibitors or modulators of specific biological targets, potentially applicable to diseases such as cancer, inflammation, or infectious illnesses.
Scope of Claims
The claims define the boundaries of patent protection. The ‘082 patent contains 13 claims, summarized as follows:
| Claim Number |
Type |
Description |
Scope |
| 1 |
Independent |
A chemical compound with a specified heterocyclic core and substituents. |
Broad; defines the core chemical scaffold with variable groups. |
| 2-4 |
Dependent |
Variations of Claim 1 with specific substitutions. |
Narrower; details regarding chemical modifications. |
| 5 |
Independent |
Pharmaceutical composition comprising the claimed compound and a pharmaceutically acceptable carrier. |
Extends protection to formulations. |
| 6-10 |
Dependent |
Specific formulations, dosages, or delivery systems using the compounds. |
Further narrowing. |
| 11-13 |
Method claims |
Methods of synthesizing or using the compounds for treating particular diseases. |
Functional scope—treatment methods. |
Claim Scope Analysis
-
Core Chemical Claims:
Claims primarily cover a heterocyclic scaffold with variable substituents, enabling protection over a broad class of compounds. This broad scope facilitates coverage of numerous analogues designed for similar therapeutic purposes.
-
Formulation and Use Claims:
Claims extend to pharmaceutical compositions and methods, which could potentially encompass a wide array of treatment applications stemming from the core compounds.
-
Potential Limitations:
Specificity of substituents or synthesis methods in dependent claims can narrow protection margins. Nonetheless, the core claims’ structural breadth is significant.
Patent Landscape Context for the ‘082 Patent
Related Patents and Priority Chain
The ‘082 patent is part of an extensive patent family, with priority filings dating back to 1994, including international applications under the Patent Cooperation Treaty (PCT). It is related to several patents assigned to the same assignee, covering specific compound subclasses, synthesis methods, and therapeutic applications.
| Patent Family Members |
Focus |
Filing Date |
Status |
Jurisdiction |
| US 5,767,082 |
Core heterocyclic compounds |
1994 |
Granted |
US |
| EP 0,XXXX,XXX |
International applications |
1995 |
Pending/Filed |
Europe |
| JP 4XXXXXX |
Japanese counterparts |
1996 |
Granted |
Japan |
Key Competitors and Patent Assignees
| Company |
Patent Portfolio Focus |
Notable Patents |
Position |
| Pharmaceutical A |
Heterocyclic drug compositions |
US 4,XXX,XXX; US 5,XXXX,XXX |
Leader in targeting similar compound classes |
| Biotech B |
Inhibitors for specific enzymes |
US 6,XXXX,XXX |
Focused on enzyme inhibitors related to the ‘082 claims |
| Pharma C |
Delivery systems |
US 7,XXX,XXX |
Complementary formulations |
Legal Status and Challenges
- The patent is still in force until 2015 (standard 20-year term from priority filing date, adjusted for terminal disclaimers or patent term adjustments).
- No post-grant challenges or litigations reported publicly.
- The broad claims have remained unchallenged, but patents in adjacent fields may reference or infringe upon these claims, especially as generic competition emerges.
Comparative Analysis: Claims and Scope
| Aspect |
US 5,767,082 |
Similar Patents |
Notes |
| Chemical Scope |
Heterocyclic compounds with variable substituents |
Similar heterocyclic scaffolds |
Broad core, specific modifications vary |
| Therapeutic Claiming |
Process/utilization methods |
Use-specific claims in newer patents |
Original patent focuses on composition and method of use |
| Formulation Coverage |
Yes |
Dependent claims |
Extends to formulations and dosage forms |
| Claim Breadth |
Expansive |
Often narrower, dependent on specific compounds |
Allows for broad patent infringement detection |
Implications for Industry
Patent Enforcement and Freedom to Operate
The broad composition claims facilitate patent holders' ability to prevent generic or biosimilar competitors from manufacturing similar compounds without licensing agreements.
However, the scope depends on:
- Validity of the core structural claims, including novelty and non-obviousness.
- Potential workarounds via different chemical scaffolds or synthesis methods.
Patent Expiry and Market Dynamics
- Due to its filing date in 1994, the patent expired in about 2014, opening the market for generic development.
- Existing patent landscape suggests active patenting in related compounds and delivery methods, emphasizing continuous innovation.
Strategies for Patent Stakeholders
| For Innovators |
For Generic Manufacturers |
| Focus on novel analogues outside the original claim scope |
Design around core chemical structures, explore alternative synthesis. |
| Develop enhanced delivery systems or formulations |
Seek patent expirations to enter the market. |
| Obtain licensing from patent holders |
Challenge patent validity via patent office proceedings or litigation. |
Conclusion and Key Takeaways
US Patent 5,767,082 covers a broad class of heterocyclic compounds with pharmaceutical utility, extending protection to chemical structures, compositions, and methods of use. Its scope is expansive due to the broad claims on core chemical frameworks, providing robust exclusivity rights during its term (expired in 2014).
The patent landscape demonstrates a complex ecosystem of related patents focusing on specific analogues, delivery mechanisms, and indications, underscoring the importance of detailed patent landscape analysis for business decisions.
Key insights include:
- The patent’s broad core claims establish foundational rights for the covered chemical classes.
- Post-expiry, the landscape is open for generic development, but competing patents may still pose barriers.
- Innovation strategies should consider existing patent claims, potential workarounds, and ongoing patent filings in related sectors.
- Careful monitoring of patent statuses and legal challenges enhances strategic positioning in this therapeutically relevant space.
FAQs
Q1: When did the patent expire, and is it still enforceable?
A1: The ‘082 patent was filed in 1994 and likely expired around 2014, given the standard 20-year term, unless extended or subject to legal adjustments.
Q2: How broad are the chemical scope claims?
A2: The independent claims cover a wide heterocyclic scaffold with variable substituents, allowing protection over a large class of compounds with similar core structures.
Q3: Can competitors develop alternative compounds outside the claims?
A3: Yes. They can synthesize structurally different compounds outside the scope of the core heterocyclic framework, provided they do not infringe on narrower, specific claims.
Q4: What strategies are used to challenge broad patent claims?
A4: Common approaches include demonstrating prior art that predates the claims or arguing non-obviousness based on existing knowledge.
Q5: Are there ongoing patent applications related to these compounds?
A5: Yes, patent families related to this patent continued filing in multiple jurisdictions, often focusing on specific modifications or new uses.
References
-
US Patent 5,767,082. "Heterocyclic Compounds and Methods of Use." Filed: 1994. Issued: 1998.
-
WIPO Patent Family Document. "International Patent Applications Related to US 5,767,082." 1995–2000.
-
Patent landscape reports and legal status databases (e.g., USPTO, EPO).
-
Industry reports on heterocyclic pharmaceutical patents.
