Patent US2729481A successfully refreshed from Google Patents.
Patent US3450158A successfully refreshed from Google Patents.
US3450158A
Expired / Lapsed
US
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Parallel check valve such as used for vehicle braking
Assignee: Alco Controls Corp
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Filing: 1966-10-14
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Granted: 1969-06-17
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Expires: 1986-10-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Tilney
- 👤 George H Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:55
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/28; B60T13/00; B60T13/10; B60T13/66; B60T13/68; B60T13/686; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87257
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2472544A
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US2502118A
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US2623541A
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US2638118A
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US2762476A
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US2964141A
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US3153426A
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US3106221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |