Patent US4331138A successfully refreshed from Google Patents.
Patent US3389012A successfully refreshed from Google Patents.
US3389012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teflon coating on edges of contact lens
Assignee: W-J (DELAWARE) Inc
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Filing: 1965-07-15
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Granted: 1968-06-18
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Expires: 1985-07-15
Abstract
No abstract record available.
Inventors
- 👤 Homer A Hamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:51
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/62; B29; B29D; B29D11/00; B29D11/00865; B05D2506/00; B05D2506/10; B05D2506/15
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
IN A CONTACT LENS COMPRISING A CENTRALLY LOCATED OPTICAL PORTION AND S SURROUNDING EDGE PORTION, THE IMPROVEMENT COMPRISING A COATING ON SAID EDGE PORTION OF THE LENS, SAID COATING COMPRISING A TETRAFLUOROETHYLENE POLYMER, AND SAID COATING BEING FORMED ON THE INTERIOR SURFACE OF THE LENS FOR DISPOSITION AGAINST THE EYE OF THE WEARER OF THE LENS.
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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |