US2823699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valved coupling embodying fluid pressure actuated locking means
Assignee: Willis Oil Tool Co
•
Filing: 1953-11-20
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Granted: 1958-02-18
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Robert S Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:51
CPC Classifications
F; F16; F16L; F16L29/00; F16L37/00; F16L37/08; F16L37/10; F16L37/113; F16L37/28; F16L37/38; F16L37/44; F16L41/00; F16L41/008; G; G01; G01L; G01L19/00; G01L19/0007; Y; Y10; Y10S; Y10S285/00; Y10S285/918; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86678
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |