US3282357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic derrick assembly
Assignee: Individual
•
Filing: 1965-05-12
•
Granted: 1966-11-01
•
Expires: 1985-05-12
Abstract
No abstract record available.
Inventors
- 👤 John R Bunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:50
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14; E21B7/00; E21B7/12; E21B7/122
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
164 words
A DRILLING DERRICK, COMPRISING AS ONE OF THE SUPPORTING LEGS A CYLINDER; AN OUTER RAM COAXIALLY CARRIED WITHIN AND MOVABLE RELATIVE TO AND AT LEAST PARTIALLY EXTENDABLE FORM ONE END OF SAID CYLINDER, SAID OUTER RAM HAVING A HYDRAULIC ACTUATING SURFACE AREA TRANSVERSE TO THE DIRECTION OF MOVEMENT OF SAID OUTER RAM; AN INNER RAM COAXIALLY CARRIED WITHIN SAID OUTER RAM AND MOVABLE RELATIVE TO AND AT LEAST PARTIALLY EXTENDABLE FROM ONE END OF SAID CYLINDER, SAID INNER RAM HAVING A HYDRAULIC ACTUATING SURFACE AREA TRANSVERSE TO THE DIRECTION OF MOVEMEMT OF SAID INNER RAM DIFFERENT FROM THE HYDRAULIC SURFACE AREA OF SAID OUTE RAM; A SOURCE OF PRESSURE INCLUDING A CHAMBER, SAID CHAMBER IN COMMUNICATIONS WITH THE HYDRUALIC ACTUATING SURFACE AREA OF SAID INNER RAM; A PASSAGE COMMUNICATING SAID CHAMBER WITH THE HYDRAULIC ACTUATING SURFACE AREA OF SAID OUTER RAM; AND A VALVE FOR SELECTIVELY CONTROLLING THE FLOW OF FLUID FROM SAID CHAMBER TO THE HYDRAULIC ACTUATING SURFACE AREA OF SAID OUTER RAM.
References Cited (Backward Citations)
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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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |