Patent US2478679A successfully refreshed from Google Patents.
US2478679A
Expired / Lapsed
US
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Projector drive mechanism
Assignee: RCA Corp
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Filing: 1945-10-23
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Granted: 1949-08-09
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Expires: 1965-10-23
Abstract
No abstract record available.
Inventors
- 👤 Sten E Bartelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:17
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/18; G03B1/38; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1987; Y10T74/19879
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US325220A
Cited
FR377827A
Cited
FR428849A
Cited
US1521785A
Cited
US1389824A
Cited
US1531085A
Cited
US1746385A
Cited
FR846703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |