Patent US3187338A successfully refreshed from Google Patents.
US3187338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal contact lens of wide fitting range with sine curve concave surface
Assignee: NEEFE HAMILTON RES CO
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Filing: 1962-02-19
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Granted: 1965-06-01
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Charles W Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:08
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
50 words
A CORNEAL CONTACT LENS OF CONCAVO-CONVEX FROM IN SECTION, OF A SIZE TO LIE WITHIN THE AREA DEFINED BY THE LIMBUS, HAVING A CONCAVE, ASPHERIC SURFACE WHOSE CURVATURE IS A SINE CURVED, AND AN OUTER AREA HAVING A RADIUS OF CURVATURE LONGER THAN THE CORNEA OF WHICH THE LENS IS
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) | 1968-05-31 | 1968-11-30 | 1969-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-31 | 1972-11-30 | 1973-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-31 | 1976-11-30 | 1977-06-01 | $7700.00 | Window Closed / Lapsed |