US2707618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four engine compounding arrangement for drive shaft of a rotary drilling rig and two mud pumps
Assignee: BREWSTER Co
•
Filing: 1952-02-06
•
Granted: 1955-05-03
•
Expires: 1972-02-06
Abstract
No abstract record available.
Inventors
- 👤 Brown Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:47
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19014
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1954670A
Cited
US2161075A
Cited
US2405546A
Cited
US2246478A
Cited
US2536483A
Cited
US2568385A
Cited
US2568134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |