US3476499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectively light absorbing contact lens
Assignee: Czech Academy of Sciences
•
Filing: 1965-01-04
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Granted: 1969-11-04
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Otto Wichterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:23
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; B29D11/00894; B29D11/00903; B29D11/00009; B29D11/00317; D; D06; D06P; D06P1/00; D06P1/0076; D06P3/00; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/046; G03; G03C; G03C1/00; G03C1/494; G03C1/496
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2524811A
Cited
US2558735A
Cited
US2976576A
Cited
US3083118A
Cited
US3227510A
Cited
US3193509A
Cited
US3235381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |