US2896498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derotation prism
Assignee: Librascope Inc
•
Filing: 1955-02-07
•
Granted: 1959-07-28
•
Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 Brandon Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:34
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB115101A
Cited
US2784645A
Cited
GB189911556A
Cited
US2550962A
Cited
FR1010654A
Cited
US2678580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |