US2647437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picture unit for stereopticons
Assignee: INSTR DEV LAB Inc
•
Filing: 1949-05-17
•
Granted: 1953-08-04
•
Expires: 1969-05-17
Abstract
No abstract record available.
Inventors
- 👤 George P Bentley
- 👤 Frank R House
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:41
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06; G03B21/00; G03B21/06; G03B23/00; G03B23/08; G03B23/10; G03B23/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1918705A
Cited
US2314417A
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US2369483A
Cited
GB605270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |