US2485873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making finished circumferentially surfaced lenses from lens stock
Assignee: United States Department of the Navy
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Filing: 1944-02-05
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Granted: 1949-10-25
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Expires: 1964-02-05
Abstract
No abstract record available.
Inventors
- 👤 William J Flett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:02
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US221552A
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US1098905A
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US1085611A
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US1457804A
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US1556566A
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US2314838A
Cited
US2137598A
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US2259902A
Cited
US2237744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |