Patent US2687884A successfully refreshed from Google Patents.
US2687884A
Expired / Lapsed
US
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Film advancing and filtering mechanism
Assignee: RCA Corp
•
Filing: 1951-10-18
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Granted: 1954-08-31
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Expires: 1971-10-18
Abstract
No abstract record available.
Inventors
- 👤 Hugh C Ward
- 👤 James L Pettus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:49
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1831562A
Cited
GB370001A
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US1909074A
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US2091692A
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GB477943A
Cited
US2209582A
Cited
US2108337A
Cited
GB506654A
Cited
US2349018A
Cited
US2418544A
Cited
US2418545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |