Patent US4264575A successfully refreshed from Google Patents.
US4264575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contraceptive methods and compositions
Assignee: Eli Lilly and Co
•
Filing: 1980-04-08
•
Granted: 1981-04-28
•
Expires: 2000-04-08
Abstract
Abstract Introduction of a pharmaceutically acceptable non-toxic cation salt of a straight-chain or branched chain alkyl sulfonate having from 11 to 16 carbon atoms into the uterine lumen or vaginal cavity prevents conception. Sodium tetradecyl sulfonate is preferred.
Inventors
- 👤 Ronald E. Zimmerman
- 👤 Philip J. Burck
- 👤 C. David Jones
- 👤 Arvind L. Thakkar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:12
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/185; A61K9/00; A61K9/0012; A61K9/0034
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
A contraceptive composition suitable for insertion and comfortable retention in the uterine lumen which comprises: (a) about 1 to about 40 percent by weight of a pharmaceutically acceptable, non-toxic cation salt of a straight chain or branched chain alkyl sulfonate having from 11 to 16 carbon atoms and (b) about 60 to about 99 percent by weight of a biocompatible, bioinsoluble, flexible silicone rubber carrier matrix, said matrix being capable of continuously releasing said alkyl sulfonate salt into the uterine fluids at a controlled rate over a prolonged period of time.
Claim 2
Dependent Claim
91 words
A contraceptive composition suitable for insertion and comfortable retention in the uterine lumen which comprises: (a) about 1 to about 40 percent by weight of a pharmaceutically acceptable, non-toxic cation salt of a straight chain or branched chain alkyl sulfonate having from 11 to 16 carbon atoms and (b) about 60 to about 99 percent by weight of a biocompatible, bioinsoluble, flexible silicone rubber carrier matrix, said matrix being capable of continuously releasing said alkyl sulfonate salt into the uterine fluids at a controlled rate over a prolonged period of time.
Claim 3
Dependent Claim
13 words
A composition as defined in claim 1 wherein the silicone rubber is dimethylpolysiloxane.
Claim 4
Dependent Claim
16 words
A composition as defined in claim 1 or 2, wherein the alkyl sulfonate is n-tetradecyl sulfate.
Claim 5
Dependent Claim
12 words
A composition as defined in claim 3 wherein the cation is sodium.
References Cited (Backward Citations)
US3279996A
Cited
US3545439A
Cited
US3920805A
Cited
US3903880A
Cited
US4016251A
Cited
US3888975A
Cited
US4034749A
Cited
US4014987A
Cited
US4012497A
Cited
US4012496A
Cited
US4053580A
Cited
US4067961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |