|
Patent landscape, scope, and claims: |
Patent Landscape and Claims Analysis for U.S. Patent 6,248,775
What Is the Scope of U.S. Patent 6,248,775?
U.S. Patent 6,248,775, issued on June 19, 2001, covers a method for synthesizing and utilizing cobalt-porphyrin complexes as catalysts for oxidation reactions. The patent primarily focuses on the molecular design of cobalt-porphyrins, their preparation, and application in oxidation processes relevant to pharmaceuticals and industrial chemistry.
Core Claims:
- Catalyst Composition: The patent claims the cobalt-porphyrin complexes, specifically cobalt-centered porphyrins with particular substituents that improve stability and reactivity.
- Preparation Method: Several claims detail synthesis procedures involving metallation of porphyrin precursors, choice of solvents, and conditions for metal insertion.
- Application of Catalysts: The patent claims the use of these complexes in oxidation reactions, including hydroxylation, epoxidation, and oxidation of hydrocarbons, with specific emphasis on oxidative transformations of organic substrates.
Scope Limitations:
- The claims specify cobalt as the central metal.
- The porphyrin ligands consist of specific substituents, such as methyl, phenyl, or carboxyaryl groups.
- Reactions are limited to organic oxidation processes, notably in controlled, catalyzed environments.
Detailed Claims Breakdown
| Claim Type |
Number of Claims |
Description |
| Independent |
3 |
Cover the catalyst compositions, synthesis methods, and their use in oxidation reactions |
| Dependent |
14 |
Specify particular substituents, reaction conditions, and particular substrate examples |
Notable Claims
- Claim 1: Covers cobalt-porphyrin complexes with specific substituents.
- Claim 2: Addresses a process of preparing the cobalt complexes by metallation of free-base porphyrins.
- Claim 10: Describes applying the cobalt-porphyrin catalysts to oxidize hydrocarbons or organic compounds.
Patent Landscape Context
Prior Art and Patent Citations
This patent builds upon prior art related to metalloporphyrins, notably work dating back to the 1970s and 1980s, such as:
- Kauffman et al. (1979), on metalloporphyrin oxidation catalysts.
- Harris and Turpin (1985), exploring catalyst stability.
- Subsequent patents, such as U.S. Patent 5,731,351, also cover metalloporphyrin complexes.
Patent Family and Filing Timeline
| Patent |
Filing Date |
Issue Date |
Priority Date |
Country Coverage |
Key Claims |
| 6,248,775 |
April 24, 1998 |
June 19, 2001 |
April 24, 1998 |
US (also family in EP, WO), EP, JP |
Focus on cobalt-porphyrin synthesis and oxidation use |
Expanding Patent Landscape
- Similar patents exist covering manganese- and iron-porphyrins, used for oxidation catalysis.
- Competing patents cover non-porphyrin metall catalysts for oxidation, broadening the patent space.
- Patent applications continue to explore ligands with extra stability and activity, often citing 6,248,775.
Patentability and Challenges
The claims' specificity in substituents and reaction conditions limits challenges based on prior art but does not prevent it. The core coverage of cobalt-porphyrins and their uses remain well-established, with minor variations prone to patentability challenges.
- Novelty: Valid for specific ligand structures.
- Obviousness: Challenged if similar metalloporphyrins with minor modifications are disclosed.
- Industrial Use: Scope covers broad oxidation applications, making it a valuable patent for catalyst manufacturers.
Active Patent Lifecycle and Infringement Risks
The patent was filed in 1998 and issued in 2001, with a typical 20-year term, expiring in 2018. However, due to maintenance and renewal practices, patent rights could extend in specific jurisdictions or via continuation applications.
Additional Related Patents
- U.S. Patent 6,528,570: Focuses on modified cobalt-porphyrins with enhanced stability.
- U.S. Patent 7,045,918: Covers alternative synthesis techniques.
Key Takeaways
- The patent claims cobalt-porphyrin complexes used as oxidation catalysts with specificity over ligand substituents and reaction conditions.
- The patent landscape emphasizes metalloporphyrins, primarily cobalt, manganese, and iron variants, with applications in pharmaceuticals and industrial chemistry.
- The patent’s expiration date limits its enforceability, but similar patents and applications continue to develop the field.
- The scope covers broad oxidation reactions but may face validity challenges based on prior art.
FAQs
Q1: Can this patent be used for industrial oxidation processes today?
A1: Since the patent expired in 2018, the technology can be freely used, provided no other active patents cover the same catalysts with different modifications.
Q2: Are any specific ligand modifications key for patentability?
A2: Yes, particular substituents on the porphyrin ring, such as phenyl or carboxyaryl groups, are claimed for their effect on catalyst stability and activity.
Q3: How does this patent compare with other metalloporphyrin patents?
A3: It focuses explicitly on cobalt complexes with defined substitution patterns, whereas others may cover manganese or iron variants or different ligand structures.
Q4: What challenges exist in developing new cobalt-porphyrin catalysts?
A4: Challenges include improving stability, selectivity, and activity while avoiding infringement on the known prior art and existing patents.
Q5: Is there potential for patenting improvements to this technology?
A5: Yes, modifications such as novel ligand substituents, improved synthesis methods, or application in specific oxidation reactions could be patentable if they demonstrate novelty and inventive step.
References
- U.S. Patent 6,248,775 (2001).
- Kauffman, L., et al. (1979). Metalloporphyrin oxidation catalysts. Journal of Catalysis.
- Harris, D. A., & Turpin, J. A. (1985). Stability of metalloporphyrins. Inorganic Chemistry.
- U.S. Patent 5,731,351 (1998). Metalloporphyrin catalysts.
[1] Patent Number 6,248,775. United States Patent and Trademark Office.
[2] Kauffman et al., 1979. Journal of Catalysis.
[3] Harris & Turpin, 1985. Inorganic Chemistry.
[4] U.S. Patent 5,731,351.
More… ↓
⤷ Start Trial
|
