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Patent US2994166A successfully refreshed from Google Patents.
US2994166A
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Method of making multifocal lenses
Assignee: American Optical Corp
•
Filing: 1957-12-13
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Granted: 1961-08-01
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Expires: 1977-12-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Bardwell
- 👤 Russell J Cassettari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:06
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/0012; G; G02; G02C; G02C7/00; G02C7/02; G02C7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1410367A
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US2310925A
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US2493206A
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US2607174A
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US2582087A
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US2683342A
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US2723514A
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US2890551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |