Patent US2644985A successfully refreshed from Google Patents.
US2644985A
Expired / Lapsed
US
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Contact lens and method and apparatus for making same
Assignee: American Optical Corp
•
Filing: 1947-03-22
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Granted: 1953-07-14
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Expires: 1967-03-22
Abstract
No abstract record available.
Inventors
- 👤 Harry D Crandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:35
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/021; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00086; B29L; B29L2011/00; B29L2011/0016; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |