US3501810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure release check valve for pressure operated injection nozzle
Assignee: National Automatic Tool Co Inc
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Filing: 1967-04-17
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Granted: 1970-03-24
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Russell W Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:50
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/20; B29C45/23; B29C45/46; B29C45/47; B29C45/50; B29C45/52; Y; Y10; Y10S; Y10S425/00; Y10S425/224; Y10S425/226
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) | 1973-03-23 | 1973-09-22 | 1974-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-23 | 1977-09-22 | 1978-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-23 | 1981-09-22 | 1982-03-24 | $7700.00 | Window Closed / Lapsed |