US3517681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosity independent pressure regulating valve
Assignee: RTX Corp
•
Filing: 1968-05-23
•
Granted: 1970-06-30
•
Expires: 1988-05-23
Abstract
No abstract record available.
Inventors
- 👤 Bartholomew J Davison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:38
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/04; F15B21/045; G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/101; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7801; Y10T137/7805; Y10T137/7806
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3123094A
Cited
US2196279A
Cited
US2739607A
Cited
US2858700A
Cited
US2902047A
Cited
US2881793A
Cited
US3174505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |