US3495049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer wear indicator
Assignee: Michigan Magnetics Inc
•
Filing: 1968-03-08
•
Granted: 1970-02-10
•
Expires: 1988-03-08
Abstract
No abstract record available.
Inventors
- 👤 Donald P Humphreys
- 👤 John E Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:24
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/10; G11B5/00; G11B5/40; G11B5/48; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2152943A
Cited
US2493466A
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US2856495A
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US3015950A
Cited
US3056380A
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US3236096A
Cited
US3211843A
Cited
US3138224A
Cited
US3182153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |