Patent US4604479A successfully refreshed from Google Patents.
US4604479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone-containing contact lens material and contact lenses made thereof
Assignee: PTC LIQUIDATING Corp
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Filing: 1983-06-03
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Granted: 1986-08-05
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Expires: 2003-06-03
Abstract
Abstract According to the invention contact lenses are formed of unsaturated, multifunctional, organosiloxanes alone or mixed with monofunctional organosilanes and in some cases a hardening agent such as methyl methacrylate, hydrophilic monomer wetting agents, and itaconate hydrophilic and hardening agents. The multifunctional organosiloxane adds higher impact strength and reduces brittleness, probably due to greater cross-linking density in the final product and retains the desirable properties of silicone-containing materials for use in contact lenses.
Inventors
- 👤 Edward J. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; C; C08; C08F; C08F283/00; C08F283/12; C08F283/124; C08F30/00; C08F30/04; C08F30/08; G02B; G02B1/00; G02B1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
2 words
1,7-Bis(γ-methacryloxypropyl)-1,1,3,3,5,5,7,7-octa(trimethylsiloxy) tetrasiloxane.
Claim 2
Dependent Claim
2 words
1,7-Bis(γ-methacryloxypropyl)-1,1,3,3,5,5,7,7-octa(trimethylsiloxy) tetrasiloxane.
Claim 3
Dependent Claim
2 words
1,7-Bis(γ-methacryloxypropyl)-1,1,7,7-tetra(pentamethyl disiloxanyl)-3,3,5,5-tetra(trimethylsiloxy)tetrasiloxane.
Claim 4
Dependent Claim
2 words
1,7-Bis(γ-methacryloxypropyl)-1,1,7,7-tetra(pentamethyl disiloxanyl)-3,3,5,5-tetra(trimethylsiloxy)tetrasiloxane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |