US3542907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of temporarily deforming hydrophilic contact lenses,grinding and polishing
Assignee: Czech Academy of Sciences
•
Filing: 1967-02-15
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Granted: 1970-11-24
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Expires: 1987-02-15
Abstract
No abstract record available.
Inventors
- 👤 Otto Wichterle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:46
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/0025; G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124623A
Cited
US2342378A
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US2302918A
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US2664025A
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US3221083A
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US3064401A
Cited
US3248460A
Cited
US3297422A
Cited
US3263005A
Cited
US3361858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |