US3519010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow comparing shut-off valve
Assignee: McDonnell Douglas Corp
•
Filing: 1967-12-21
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Granted: 1970-07-07
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Expires: 1987-12-21
Abstract
No abstract record available.
Inventors
- 👤 Raymond P Helling
- 👤 Allen H Owen Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:43
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/005; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/7722; Y10T137/7837; Y10T137/785; Y10T137/7852
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US931532A
Cited
US1631142A
Cited
US2217635A
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US2428150A
Cited
US2574416A
Cited
US2557333A
Cited
US3234959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |