US3484074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically operated valve with polarity reversing switch
Assignee: Roberts Kitchener Lynes & Bull
•
Filing: 1967-04-24
•
Granted: 1969-12-16
•
Expires: 1987-04-24
Abstract
No abstract record available.
Inventors
- 👤 Roberts Kitchener Lynes
- 👤 John Marden Willis
- 👤 John William Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:18
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/08; F16K31/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2310562A
Cited
US2575086A
Cited
US2777993A
Cited
US2962593A
Cited
US3206160A
Cited
US3368788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |