Patent US2688271A successfully refreshed from Google Patents.
US2688271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination system for the projection of pictures
Assignee: Individual
•
Filing: 1951-03-30
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Granted: 1954-09-07
•
Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Gretener Edgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:03
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/2006; G03B21/2026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1750910A
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US2107148A
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GB457057A
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US2379790A
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US2422954A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |