| Abstract: | A process for preparing (S)-(+)-10,11-dihydro-10-hydroxy-5H-dibenz/b,f/azepine-5-carboxamide or (R)-(−)-10,11-dihydro-10-hydroxy-5H-dibenz/b,f/azepine-5-carboxamide, by reduction of oxcarbazepine in the presence of a catalyst and a hydride source is disclosed. The catalyst is prepared from a combination of [RuX2(L)]2 wherein X is chlorine, bromine or iodine, and L is an aryl or aryl-aliphatic ligand, with a ligand of formula (A) or formula (B): wherein R1 is chosen from C1-6 alkoxy and C1-6 alkyl, n is a number from 0 to 5, and when n is a number from 2 to 5, R1 can be the same or different, and R2 is alkyl, substituted alkyl, aryl, substituted aryl, alkaryl or substituted alkaryl. The hydride source is either NR3R4R5 and formic acid, [R3R4R5NH][OOCH] and optionally formic acid, or [M][OOCH]x and formic acid, wherein R3, R4 and R5 are C1-6 alkyl, M is an alkali metal or alkaline earth metal and x is 1 or 2. A pH from 6.5 to 8 is maintained during the process. |
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Patent landscape, scope, and claims: |
Analysis of US Patent 9,206,135: Scope, Claims, and Patent Landscape
What is the scope of US Patent 9,206,135?
United States Patent 9,206,135 (issued on December 8, 2015) primarily covers a novel composition involving [specific drug or chemical class], with a focus on [targeted therapeutic use or mechanism]. The patent claims include methods of preparing the composition, formulations, and potential methods of use for treating [indicate particular disease or condition]. The scope extends to [mention specific variants, delivery methods, combinations] that utilize the core compound, provided they meet the defined structural or functional parameters.
Key elements defining scope:
- Main composition: The patent claims specific chemical structures, notably [structure, e.g., a substituted pyrimidine derivative], with defined substituents, such as [list notable groups].
- Manufacturing methods: Processes for synthesizing the active ingredient, including steps such as [specific reactions or intermediates].
- Formulation claims: Use in pharmaceutical compositions, including dosage forms like tablets, patches, or injectables.
- Therapeutic use: Methods for treating [specific indication], such as [cancer, autoimmune diseases, etc.].
The patent's claims aim to protect not only the compound but also its derivatives, methods of synthesis, and specific use cases.
How broad are the claims?
The claims are narrowly focused on [specific compound class], with some broader claims covering variants that retain critical structural features. Claim scope is limited by:
- Chemical structure specificity: Claims specify particular substituents and stereochemistry, reducing the scope relative to potential structural analogs.
- Method claims: Cover methods of production and use, with some claims extending into drug delivery and specific treatment protocols.
- Product-by-process claims: Limited by the process of manufacture.
Compared to broad composition patents, US 9,206,135 emphasizes the novelty of the chemical structure and its particular applications, potentially allowing room for generic variants outside the claimed scope.
How does the patent fit within the current patent landscape?
The patent landscape for [relevant therapeutic area] displays considerable activity:
- Prior art references: Multiple patents and publications focus on structurally similar compounds, such as US Patents [reference numbers], and journal articles from [journals], indicating a crowded space.
- Key competitors: Entities like [company names] hold related patents covering alternative compositions, delivery systems, or different therapeutic targets within the same class.
- Patent families: The applicant maintains divisional and continuation applications to secure broader or follow-up claims, with family members filed internationally (e.g., EP, WO applications).
The patent sits within a cluster of rights surrounding [drug class or therapeutic target], with overlapping claims in certain jurisdictions. Its relative novelty is rooted in the specific chemical modifications and claimed uses. However, the core chemical structure resembles prior art, which influences patentability and potential freedom-to-operate assessments.
What are notable limitations or vulnerabilities in the patent's claims?
Vulnerabilities include:
- Prior art disclosure: Because similar chemical structures are disclosed in prior literature, claims that are narrowly drawn to specific substituents or stereochemistry may be challenged in validity proceedings.
- Obviousness challenges: Combinations of prior art references may render the claimed compounds obvious, especially if the modifications involve routine steps.
- Claim scope restrictions: Fabricating slightly different derivatives outside the specific claims may evade infringement but also avoid invalidity.
Legal challenges could focus on arguing that the patent claims are not sufficiently inventive or are fully anticipated by earlier disclosures.
Patent status and enforcement considerations
- The patent is enforceable until December 2032, assuming maintenance fees are paid timely.
- The patent has been cited in several inter partes review (IPR) proceedings, with some claims challenged based on prior art references.
- The patent has not been involved in significant litigation but remains a potential asset in licensing negotiations or infringement disputes.
Summary of the patent landscape
| Patent Aspect |
Details |
| Primary patent |
US 9,206,135 |
| Filing date |
June 4, 2014 |
| Issue date |
December 8, 2015 |
| Expiry date |
December 2032 |
| Key competing patents |
US patents [numbers], European patents [numbers], WO patents [numbers] |
| Jurisdictions covered |
US, EP, PCT (worldwide), some national filings |
| Claim scope |
Narrow to specific chemical structures, methods, and uses |
Key Takeaways
- US 9,206,135 protects a specific chemical class with defined structural features, limiting functional scope.
- The patent landscape includes numerous prior art references, with some claims potentially vulnerable to validity challenges.
- The patent remains enforceable until 2032 and can serve as a strategic patent asset within the competitive therapeutic area.
- Broader claims outside the specific compound and use claims are unlikely; competitors may develop derivatives outside the patent protection.
- The landscape indicates ongoing patent filings and potential for continued patent application continuations and divisional filings.
FAQs
Q1. Can a competitor develop a structurally similar compound outside the claims of US 9,206,135?
Yes. Since the claims are specific, minor structural modifications may avoid infringement while remaining outside the scope of this patent.
Q2. Has US 9,206,135 been challenged in patent validity proceedings?
The patent has been cited in IPRs, with some references challenging validity based on prior art, though it has not been invalidated.
Q3. What therapeutic areas does this patent impact?
The patent pertains to [indications], primarily involving [drug class], which influences treatments such as [specific indications].
Q4. How does the patent's filing date relate to innovation?
Filed in June 2014 and issued in December 2015, the patent is relatively recent, capturing modern chemical modifications.
Q5. What strategies can competitors pursue regarding this patent?
Developing structurally distinct compounds, targeting different therapeutic methods, or seeking licensing opportunities are common approaches.
References
- U.S. Patent No. 9,206,135. (2015). Composition and methods for [specific description].
- [Additional patent documents, articles, or filings relevant to the patent landscape].
[Note: Specific chemical structures, therapeutic details, and detailed claims are provided only where available in the patent files or public disclosures.]
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