Patent US2737847A successfully refreshed from Google Patents.
US2737847A
Expired / Lapsed
US
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Magnetic bi-focal lens holder
Assignee: Individual
•
Filing: 1952-10-20
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Granted: 1956-03-13
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Expires: 1972-10-20
Abstract
No abstract record available.
Inventors
- 👤 Tesauro Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; G02C2200/00; G02C2200/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US648165A
Cited
US1395625A
Cited
US2147482A
Cited
US2217475A
Cited
FR915421A
Cited
US2598272A
Cited
US2613104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |