Patent US2525598A successfully refreshed from Google Patents.
US2525598A
Expired / Lapsed
US
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Optical projection system in a stereoscopic projector
Assignee: WESTERN PHOTO SUPPLY CO
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Filing: 1947-06-30
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Granted: 1950-10-10
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Expires: 1967-06-30
Abstract
No abstract record available.
Inventors
- 👤 Gruber Wilhelm Beller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:55
CPC Classifications
G; G03; G03B; G03B35/00; G03B35/18; G03B35/20
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |