US2442564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for camera or projector lenses for producing reversed images
Assignee: Individual
•
Filing: 1942-05-06
•
Granted: 1948-06-01
•
Expires: 1962-05-06
Abstract
No abstract record available.
Inventors
- 👤 Heyer Don
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:12
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US784852A
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US784487A
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FR388415A
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US1631866A
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GB330310A
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US1878967A
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US2019234A
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US2137570A
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US2085050A
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US2143011A
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US2257551A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-01 | 1951-12-01 | 1952-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-01 | 1955-12-01 | 1956-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-01 | 1959-12-01 | 1960-06-01 | $7700.00 | Window Closed / Lapsed |