Patent US2683397A successfully refreshed from Google Patents.
US2683397A
Expired / Lapsed
US
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High-aperture wide angle threecomponent projecting lens
Assignee: W AND L E GURLEY
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Filing: 1952-11-03
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Granted: 1954-07-13
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Expires: 1972-11-03
Abstract
No abstract record available.
Inventors
- 👤 Gunther F E Loeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:30
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2536500A
Cited
US1558073A
Cited
US1741947A
Cited
US1924527A
Cited
US2084714A
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US2328157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |