US3621079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft of hydroxyalkyl methacrylate onto polyvinylpyrrolidone
Assignee: American Optical Corp
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Filing: 1968-10-21
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Granted: 1971-11-16
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Expires: 1988-10-21
Abstract
Abstract A polymeric plastic material suitable for contact lenses, dental liners and other prosthetic devices, intrauterine devices, and other devices to be used in or in the treatment of the body. It is made from a monomer having the formula WHEREINN IS 2 OR 3, POLYMERIZED WITH POLYVINYL PYRROLIDONE OR POLYVINYL PYRROLIDONE/VINYL ACETATE COPOYLMER. The application also discloses procedures for making contact lenses, dental liners, and intrauterine devices from such polymeric material.
Inventors
- 👤 Harry R Leeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:45
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/16; A61C; A61C13/00; A61F; A61F6/00; A61F6/06; A61F6/14; A61F6/142; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; C; C08; C08F; C08F271/00; C08F271/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
16 words
A polymeric material as described in claim 1 wherein the value of small n is 2.
Claim 2
Dependent Claim
23 words
A polymeric material as described in claim 1 wherein the amount of polyvinylpyrrolidone or of said copolymer is about 10 to 50 percent.
Claim 3
Dependent Claim
16 words
A polymeric material as described in claim 1 wherein said monomer is graft copolymerized with polyvinylpyrrolidone.
Claim 4
Dependent Claim
18 words
A polymeric material as described in claim 1 wherein said monomer is graft copolymerized with said vinyl copolymer.
Claim 5
Dependent Claim
22 words
A polymeric material as described in claim 1 wherein the molecular weight of the polyvinylpyrrolidone or copolymer is about 10,000 to 160,000.
Claim 6
Dependent Claim
26 words
A polymeric material as described in claim 5 wherein the polyvinyl copolymer has a ratio of polyvinylpyrrolidone and vinyl acetate of about 25/75 to about 75/25.
Claim 7
Dependent Claim
52 words
A polymeric material as described in claim 1 wherein the monomer has the formula described in which n is 2, the polyvinylpyrrolidone having molecular weight from about 20,000 to 60,000 is used as the basis for graft polymerization and the amount of polyvinylpyrrolidone is about from 5 to 30 percent by weight.
Claim 8
Dependent Claim
12 words
A contact lens made from the polyMeric material described in claim 1.
Claim 9
Dependent Claim
18 words
A dental prosthetic device having as a liner adapted to contact the body, material described in claim 1.
Claim 10
Dependent Claim
11 words
An intrauterine device constructed of polymeric material described in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |