Patent US2618200A successfully refreshed from Google Patents.
US2618200A
Expired / Lapsed
US
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Composite bifocal lens
Assignee: Individual
•
Filing: 1949-03-31
•
Granted: 1952-11-18
•
Expires: 1969-03-31
Abstract
No abstract record available.
Inventors
- 👤 Clave Serge
- 👤 Clave Marcel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:52
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US392053A
Cited
US1171419A
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US1152249A
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GB338555A
Cited
US1886649A
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US1948636A
Cited
US2024552A
Cited
GB433710A
Cited
US2021812A
Cited
US2125056A
Cited
GB559865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |