Patent US3475815A successfully refreshed from Google Patents.
US3475815A
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Method of making an electromagnetic transducer
Assignee: HP Inc
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Filing: 1968-05-13
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Granted: 1969-11-04
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Expires: 1988-05-13
Abstract
No abstract record available.
Inventors
- 👤 William I Girdner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/10; G11B5/102; G11B5/105; G11B5/11; G11B5/115; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055; Y10T29/49059; Y10T29/49826; Y10T29/49893
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2888522A
Cited
US3349193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |