US2585009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric optical system
Assignee: Farnsworth Research Corp
•
Filing: 1945-08-02
•
Granted: 1952-02-12
•
Expires: 1965-08-02
Abstract
No abstract record available.
Inventors
- 👤 Henroteau Francois Char Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/02; G02B17/06; G02B17/0647; G02B17/0652
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR410263A
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US2141884A
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US2229302A
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US2273801A
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GB541651A
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US2306679A
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GB544694A
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US2327947A
Cited
US2350112A
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US2380887A
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US2305855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |