Patent US3454728A successfully refreshed from Google Patents.
US3454728A
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US
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Magnetic head having point-welded laminations and method of producing the same
Assignee: DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GmbH
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Filing: 1966-01-28
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Granted: 1969-07-08
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Expires: 1986-01-28
Abstract
No abstract record available.
Inventors
- 👤 Richard Siegemund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055; Y10T29/4906; Y10T29/49066; Y10T29/49075; Y10T29/49078
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) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |