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US2556871A
Expired / Lapsed
US
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Superposition optical image projector
Assignee: General Electric Co
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Filing: 1950-06-30
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Granted: 1951-06-12
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Expires: 1970-06-30
Abstract
No abstract record available.
Inventors
- 👤 William J Degnan
- 👤 Clarence J Kettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:24
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |