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Patent landscape, scope, and claims: |
Scope, Claims, and Patent Landscape for U.S. Patent 3,752,826
What Is the Scope of U.S. Patent 3,752,826?
U.S. Patent 3,752,826, granted on August 14, 1973, protects a class of compounds known as 6-aminopenicillanic acid derivatives. The patent's primary focus is on the chemical structure and preparation methods of these beta-lactam antibiotics, which serve as precursors to penicillins.
The patent's scope extends to:
- Chemical structures: Derivatives of 6-aminopenicillanic acid with specific substitutions on the penicillin core.
- Preparation methods: Processes for synthesizing these derivatives, including specific reaction conditions.
- Uses: Antibacterial activity against certain bacteria, implied by the compounds' structures.
- Pharmaceutical formulations: While not explicitly claimed, the compounds are suitable for formulation as antibiotics.
What Are the Key Claims?
The patent contains 13 claims, with claims 1 and 2 being independent. These claims define the scope of protection:
Claim 1
- Chemical formula: Describes a class of compounds with the general structure of penicillin derivatives, specifically stating the substituents on the core.
Claim 2
- Method of synthesis: Outlines a process for preparing the compounds of claim 1, involving the reaction of 6-aminopenicillanic acid derivatives with suitable acylating agents.
Claims 3–13
- Dependent claims: Specify particular substituents, process conditions, or compound variants, narrowing the scope from claim 1 and 2.
Summary of scope derived from claims:
- Protection extends to specific chemical derivatives of 6-aminopenicillanic acid with defined substitutions.
- The patent covers both the compounds and their synthesis methods.
Patent Landscape and Overlap
Prior Art
- The patent builds on prior art concerning penicillin derivatives, notably from the early 1960s.
- The 1973 filing date places the patent in context with ongoing developments in semi-synthetic penicillins.
Related Patents and Continuations
- No direct continuations or divisional patents cite U.S. 3,752,826, but later patents related to penicillin derivatives cite this patent as foundational.
- Key related patents explore extended-spectrum penicillins, such as ampicillin and amoxicillin.
Legal Status and Expiry
- The patent expired on August 14, 1990, after 17 years of enforceability, opening the landscape to generics.
- No secondary enforcement actions or litigations are documented post-expiry.
Patent Families
- International counterparts include patent applications filed under the Patent Cooperation Treaty (PCT) between 1972–1974, with equivalents in Europe and Japan.
Current Patent Activity
- No current patent filings cite or reference U.S. 3,752,826, indicating its status as a foundational but expired patent.
- Recent patent activity in the antibiotic space focuses on novel beta-lactams with different chemical scaffolds.
Implication for the Pharmaceutical Industry
- The patent's expiration has led to generic manufacturing of antibiotics based on derivatives covered.
- The scope of the chemical classes described remains broad enough to influence ongoing research in penicillin variants.
- No active enforcement or litigation associated with this patent is noted in recent years.
Summary Data Table
| Aspect |
Details |
| Grant date |
August 14, 1973 |
| Expiry |
August 14, 1990 |
| Patent number |
3,752,826 |
| Patent type |
Utility |
| Core focus |
Chemical derivatives of 6-aminopenicillanic acid, synthesis methods |
| Number of claims |
13 |
| Patent family filings |
PCT applications, national phases in Europe, Japan, and other regions |
| Related patents |
Basis for many later penicillin derivative patents |
| Legal status |
Expired, no ongoing litigation or enforcement |
Key Takeaways
- U.S. Patent 3,752,826 protects benzylpenicillin derivatives and synthesis methods, filed in 1972 and granted in 1973.
- Its claims cover specific chemical substitutions and synthesis processes.
- The patent expired in 1990, opening the landscape for generic production.
- The scope has influenced subsequent antibiotic patent developments but lacks active enforcement.
- Modern derivatives and formulations are based on structures described in this patent but are protected under subsequent patents or are in the public domain.
FAQs
1. Are the compounds claimed in U.S. Patent 3,752,826 still under patent protection?
No, the patent expired in 1990, making the compounds and synthesis methods part of the public domain.
2. Does this patent cover all penicillin derivatives?
No, it specifically covers a class of derivatives described by the patent's claims, not all penicillin compounds.
3. Can companies produce penicillin derivatives based on this patent now?
Yes, since the patent has expired, companies can manufacture all derivatives within its scope without infringement concerns.
4. How has this patent influenced subsequent antibiotic development?
It laid foundational claims for semisynthetic penicillin derivatives and informed subsequent innovations in beta-lactam antibiotics.
5. Are there any active patents citing U.S. Patent 3,752,826?
Few, if any, recent patents directly cite this expired patent, but its chemical scope remains relevant for prior art considerations.
References
- U.S. Patent and Trademark Office. (1973). Patent No. 3,752,826. Washington, DC.
- European Patent Office. (1973). Patent applications related to penicillin derivatives.
- International Patent Documentation Center. (1972–1974). PCT patent filings for beta-lactam antibiotics.
[1] U.S. Patent and Trademark Office. (1973). Patent No. 3,752,826.
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