US3475740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and playback apparatus for analytical signals
Assignee: INFOTRONICS CORP
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Filing: 1966-02-28
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Granted: 1969-10-28
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 Burney J Ehrlich
- 👤 David W Spence
- 👤 Clinton D Frisby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:02
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/18; H03M1/186; H03M1/187; G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8651; H03M1/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2892022A
Cited
US2937366A
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US3041415A
Cited
US3158845A
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US3217329A
Cited
US3181133A
Cited
US3243789A
Cited
US3337693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |