US3489491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corneal contact lens with hydrophilic marginal rim portion
Assignee: Individual
•
Filing: 1966-12-01
•
Granted: 1970-01-13
•
Expires: 1986-12-01
Abstract
No abstract record available.
Inventors
- 👤 Charles Patrick Creighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE45857C
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US2015241A
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US2241415A
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US2240157A
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AT167273B
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US2976576A
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US3220960A
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US3168741A
Cited
FR1327193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |