US2499351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical projection and display apparatus
Assignee: CBS Broadcasting Inc
•
Filing: 1945-12-12
•
Granted: 1950-03-07
•
Expires: 1965-12-12
Abstract
No abstract record available.
Inventors
- 👤 Rudolf C Bretz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:14
CPC Classifications
G; G03; G03B; G03B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1227075A
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US1260221A
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US1247227A
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US1261648A
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US1456233A
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US1742680A
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US1821626A
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US1945926A
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US1965875A
Cited
US2210333A
Cited
US2181405A
Cited
US2281033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |