Patent US3528639A successfully refreshed from Google Patents.
US3528639A
Expired / Lapsed
US
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Magnetic valve with lost motion connection
Assignee: TDK Micronas GmbH
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Filing: 1968-01-02
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Granted: 1970-09-15
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Expires: 1988-01-02
Abstract
No abstract record available.
Inventors
- 👤 Richard D Grayson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:53
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0682
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1282275A
Cited
US2414236A
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US2596409A
Cited
US2827923A
Cited
US2922614A
Cited
US2947510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |