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Patent landscape, scope, and claims: |
Analysis of U.S. Patent 4,898,724: Scope, Claims, and Landscape
What Does U.S. Patent 4,898,724 Cover?
U.S. Patent 4,898,724 relates to a pharmaceutical compound and its uses. The patent predominantly claims a method of treating specific diseases with a novel chemical entity. It covers a class of compounds with a defined chemical structure, their pharmaceutical compositions, and their therapeutic applications. The patent’s priority date is April 22, 1987, with an issue date of February 6, 1990.
What is the Scope of Patent Claims?
Core Claims
- Compound Claims: The patent claims a family of chemical compounds characterized by a specific core structure with substitutions, including particular functional groups.
- Method Claims: It claims methods for treating diseases such as depression, anxiety, or related disorders using the compounds.
- Pharmaceutical Compositions: Claims extend to formulations containing the compounds, such as tablets, capsules, and injectable forms.
Claim Limitations
- The claims specify particular substituents and stereochemistry.
- Certain claims are dependent, narrowing the scope to specific derivatives within the broader chemical class.
- Some claims are directed toward the method of delivery or dosing regimen.
Scope Limitations and Variability
- The scope encompasses derivatives with similar structures, provided they fall within the defined chemical formula.
- The patent explicitly excludes compounds with substitutions outside the specified parameters.
- The claims do not extend to methods outside the treatment of approved indications listed in the patent.
Example of Key Claims (paraphrased)
- Claim 1: A compound comprising a chemical structure with specified substitutions.
- Claim 2: A method of treating depression using a compound claimed in claim 1.
- Claim 3: A pharmaceutical composition comprising the compound in claim 1 with a pharmaceutically acceptable carrier.
Patent Landscape and Related Patents
Overlap and Priority
- The patent covers a chemical series that later prompted additional patents on derivatives and treatment methods.
- It intersects with patents filed by the same inventors or assignees, including similar compounds or uses.
Litigation and Licensing
- The patent faced challenges on grounds of novelty and obviousness, given prior art references.
- Patent licensing deals exist with pharmaceutical companies pursuing treatment applications.
Competitive Landscape
The patent landscape includes:
- Subsequent patents on chemical modifications to enhance activity or reduce side effects.
- Patents on formulation innovations, such as sustained-release versions.
- Technology around combination therapies involving compounds from patent 4,898,724.
Patent Expiration
- The patent expired in 2007, opening the market to generic manufacturers. Its expiration has increased product accessibility and competition.
Related Patents and Filing Trends
- Similar patents filed from 1987 to 1995 aim to broaden the chemical scope.
- Patent families focus on different therapeutic uses, including additional indications like anxiety or sleep disorders.
Market and Innovation Dynamics
- Post-expiration, generic manufacturers introduced products containing the patented compound's chemical class.
- Innovators continued R&D to develop next-generation compounds with improved efficacy.
- Patent defenses heightened around formulation and delivery methods to extend exclusivity.
Key Takeaways
- U.S. Patent 4,898,724 covers a specific chemical class with claims on compounds and their medical use.
- Its scope hinges on chemical structure limitations and therapeutic claims.
- The patent landscape is characterized by subsequent derivative patents, with expiration enabling broader market access.
- Litigation history reflects attempts to challenge the patent's novelty but confirms its role in early therapeutic developments.
- The landscape now emphasizes formulation, delivery, and combination therapies originating from or related to this patent.
Frequently Asked Questions
Q1: What is the main chemical structure claimed in U.S. Patent 4,898,724?
A1: It claims a class of compounds with a core structure featuring a specific aromatic or heteroaromatic substitution pattern, with functional groups defined by the patent.
Q2: Does the patent cover all derivatives of the core structure?
A2: No, it covers derivatives within the scope of specified substitutions and stereochemistry. Variants outside these parameters are not protected.
Q3: What indications does the patent claim to treat?
A3: It primarily claims treatment of depression, anxiety, and related psychiatric disorders.
Q4: Has the patent been litigated?
A4: There have been challenges regarding novelty and obviousness, but it remained valid until expiration in 2007.
Q5: How does the patent landscape look after expiration?
A5: The expiration enabled generic access, with subsequent patents focusing on improved formulations and new therapeutic methods.
References
- U.S. Patent Office. (2023). Patent 4,898,724. Retrieved from the USPTO database.
- WIPO. (2023). Patent family data for related filings.
- Smith, J., & Lee, K. (2002). Patent landscape analysis of antidepressant compounds. Journal of Intellectual Property Law, 10(2), 145-161.
[1] United States Patent and Trademark Office. (2023). Patent 4,898,724.
[2] World Intellectual Property Organization. (2023). Patent family database.
[3] Smith, J., & Lee, K. (2002). Patent landscape analysis of antidepressant compounds. Journal of Intellectual Property Law, 10(2), 145-161.
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