Patent US2617328A successfully refreshed from Google Patents.
US2617328A
Expired / Lapsed
US
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Rear projection screen unit for picture projections
Assignee: Individual
•
Filing: 1950-12-20
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Granted: 1952-11-11
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Expires: 1970-12-20
Abstract
No abstract record available.
Inventors
- 👤 Stableford John Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:05
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR532528A
Cited
US1474388A
Cited
US2222414A
Cited
US2231395A
Cited
US2291931A
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US2396251A
Cited
US2441159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |