US3409038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated magnetic rubber valve
Assignee: Durable Manufacturing Co
•
Filing: 1966-04-26
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Granted: 1968-11-05
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Expires: 1986-04-26
Abstract
No abstract record available.
Inventors
- 👤 Raymond H Blackford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:26
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/08; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7859; Y10T137/7861; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913; Y10T137/7915; Y10T137/792
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2649277A
Cited
US2710023A
Cited
US2754844A
Cited
GB744858A
Cited
US2959832A
Cited
US3203447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |