Patent US3501586A successfully refreshed from Google Patents.
US3501586A
Expired / Lapsed
US
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Analog to digital to optical photographic recording and playback system
Assignee: DIGITAL RECORDING Corp A DE CORP
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Filing: 1966-09-01
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Granted: 1970-03-17
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Expires: 1986-09-01
Abstract
No abstract record available.
Inventors
- 👤 James T Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:04
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B7/00; G11B7/002; G11B7/0033; H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; H04N5/00; H04N5/76; H04N5/84; H04N5/85; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/218; G11B2220/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3324237A
Cited
US3337718A
Cited
US3391247A
Cited
US3365706A
Cited
US3422219A
Cited
US3314075A
Cited
US3370504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |