US3008012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound reproduction
Assignee: PROCTOR DICTATING MACHINE CORP
•
Filing: 1957-01-25
•
Granted: 1961-11-07
•
Expires: 1977-01-25
Abstract
No abstract record available.
Inventors
- 👤 Barton A Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:02
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2032190A
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US2135026A
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US2768244A
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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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |