Patent US2869422A successfully refreshed from Google Patents.
US2869422A
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Multifocal lens having a locally variable power
Assignee: EN COMMANDITE SIMPLE ET EN NOM
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Filing: 1954-11-23
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Granted: 1959-01-20
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Expires: 1974-11-23
Abstract
No abstract record available.
Inventors
- 👤 Cretin-Maitenaz Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:30
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; G02C7/061; B; B24; B24B; B24B13/00; B24B13/0012; B24B13/06; B24B13/065; G02B; G02B3/00
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) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |