US2728547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mud release valve
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1950-11-24
•
Granted: 1955-12-27
•
Expires: 1970-11-24
Abstract
No abstract record available.
Inventors
- 👤 Robert R Crookston
- 👤 Harold F Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:07
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/126; E; E21; E21B; E21B21/00; E21B21/10; E21B21/106; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/777
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1561412A
Cited
US1721204A
Cited
US1995561A
Cited
DE664746C
Cited
US2375914A
Cited
US2587539A
Cited
US2635627A
Cited
US2574414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |