Patent US3550150A successfully refreshed from Google Patents.
US3550150A
Expired / Lapsed
US
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Magnetic recording transducer
Assignee: International Standard Electric Corp
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Filing: 1967-06-14
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Granted: 1970-12-22
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Expires: 1987-06-14
Abstract
No abstract record available.
Inventors
- 👤 Gerald Marvin Gardner
- 👤 Jorg Wintermantel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:09
CPC Classifications
G; G03; G03G; G03G19/00; G06; G06K; G06K15/00; G06K15/02; G06K15/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49055; Y10T29/4906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |