US2659271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon-germanium objective lens
Assignee: AT&T Inc
•
Filing: 1950-02-23
•
Granted: 1953-11-17
•
Expires: 1970-02-23
Abstract
No abstract record available.
Inventors
- 👤 Robert G Treuting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:55
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/14; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US576896A
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US1541407A
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US1643865A
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US1607817A
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US2314838A
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US2085437A
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US2158507A
Cited
US2425403A
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US2453218A
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US2512257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |