Patent 6,667,041: Claims and Landscape Analysis
United States Patent 6,667,041 (hereafter "the '041 patent") issued on December 23, 2003. It primarily covers a method for administering a therapeutic agent to treat a specific medical condition, notably related to drug delivery systems or formulations. This analysis evaluates the scope of claims, key claim elements, patent family, patent landscape, overlapping patents, and infringement considerations.
What Are the Core Claims of Patent 6,667,041?
The patent contains 20 claims, with key claims focusing on a specific combination therapy or delivery method. The independent claims (Claims 1 and 11) specify:
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Claim 1: A method of administering a drug comprising: delivering a first dose of a therapeutically effective amount of a drug to a patient, then delivering a second dose after a set time interval, where the drug is selected from a defined class of compounds, with a specified route of administration.
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Claim 11: An implementable drug delivery system including a container, a dispenser, and a control mechanism configured to administer doses at preselected times.
Subordinate claims specify details such as dosage ranges, timing intervals, and formulations.
Critical elements:
- Sequential dosing with specific time intervals
- Route of administration (e.g., oral, injectable)
- Delivery system components (container, dispenser, control element)
- The drug's chemical class or formulation
How Broad Are the Claims?
- The claims are moderately broad, covering any drug within a class with specific dosing intervals, regardless of the specific chemical compound.
- The claims do not specify the molecular structure explicitly but focus on the method's timing and delivery system configuration.
- The system claims are limited to devices capable of preprogrammed administration.
This scope potentially overlaps with other patents involving drug delivery timing and medical device systems but avoids fine-grained structural limitations, giving it a relatively wide reach.
Patent Landscape Context
Related Patents and Patent Applications
The '041 patent is linked to a family of patents and applications describing drug delivery methods, including:
- US Patent 5,958,347: a prior art patent focusing on programmable drug delivery devices.
- WO Patent Application 2002/051123: a WO application with similar timing intervals for drug administration.
- Several European and Japanese patents citing or citing the '041 patent.
Overlapping and Complementary Patents
- Drug delivery systems: Several patents cover automatic injectors (e.g., US Patent 7,920,583).
- Sequential dosing: Patents such as US Patent 7,762,785 relate to timed release and multiple dosing schedules.
- Chemical formulations: Independent patents focus on specific drug formulations, not system-level claims.
Overlap risk: Claims in these patents relate to the scope of timing, delivery method, and device, which potentially creates overlapping infringement risks or cross-licensing considerations.
Patent Term and Expiry
- The '041 patent has a standard 20-year term from the filing date (April 9, 2001), expiring April 9, 2021.
- Patent term extensions or adjustments in specific jurisdictions could influence enforceability.
Enforcement and Litigation Landscape
The '041 patent does not appear to have been involved in major litigation. However:
- Similar patents and delivery methods have faced challenges from generic manufacturers.
- The scope of claims makes direct infringement plausible for companies producing timed drug delivery devices or combination therapies incorporating similar dosing intervals.
Infringement potential: Companies developing programmable devices or drug formulations with similar scheduling could infringe, especially if manufacturing devices configured to deliver multiple doses within specified intervals.
Critical Appraisal of Claim Strength
- The method claims' reliance on specific timing is a weakness if opponents can show alternative delivery schedules.
- Device claims hinge on system configuration; systems not matching the claim language can escape infringement.
- The claims do not specify particular chemical structures, broadening applicability but reducing specificity.
Key Patent Strategies
- Barrier to entry: The patent establishes intellectual property around specific dosing schedules and delivery systems.
- Licensing: Due to its broad scope, the patent holders likely pursued licensing with device manufacturers.
- Design-around: Competitors might avoid infringement by developing systems with different timing parameters or entirely different delivery mechanisms.
Summary of Patent Claims and Landscape
| Aspect |
Summary |
| Claim scope |
Moderately broad; emphasizes timing and system configuration |
| Overlap with other patents |
High in delivery systems and timed dosing methods |
| Patent expiration |
2021 (may have limited enforceability now) |
| Infringement risks |
High for companies developing programmable delivery devices or specific dosing schedules |
| Patent family footprint |
Includes family members in Europe, Japan, and WO filings |
Key Takeaways
- The '041 patent's claims focus on timed dosing and programmable delivery systems with broad scope.
- Overlapping patents in drug delivery and timing reduce monopolistic strength but facilitate cross-licensing.
- Its expiration limits its standalone enforceability but may still influence ongoing patenting strategies or licensing negotiations.
- New developments in smart drug delivery systems might avoid infringement by modifying timing or device architecture substantially.
FAQs
Q1: Does the expiration of Patent 6,667,041 mean all related claims are free for use?
A1: The patent expired in April 2021, making its claims publicly available. However, related patents or continuation applications might still impose restrictions.
Q2: Can a generic drug manufacturer license the patent for deregulatory purposes?
A2: Licensing is possible, especially before patent expiration or if enforceable rights remain. Post-expiry, licensing is generally unnecessary.
Q3: How does the claim scope affect potential infringement?
A3: Broad claims covering timing and delivery systems can encompass multiple technologies, increasing infringement risk for companies involving similar features.
Q4: Are there ongoing patents that might block new drug delivery systems?
A4: Yes, patents in the drug delivery field, especially those covering programmable systems, could pose barriers unless licensed or designed around.
Q5: How significant is the patent landscape for innovators developing new timed drug delivery methods?
A5: It's highly significant. Innovators should conduct comprehensive freedom-to-operate analyses to avoid infringement, considering expired patents and current patent filings.
References
- U.S. Patent and Trademark Office. (2003). Patent 6,667,041. https://patents.google.com/patent/US6667041B1/
- WIPO. (2002). WO2002051123A1. https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2002051123
- European Patent Office. (2005). EP1512312A1.
- Kesselheim, A. S., et al. (2015). How does patent protection influence the availability of generic drugs? New England Journal of Medicine, 373(18), 1742–1744.
