US3291230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling apparatus
Assignee: Individual
•
Filing: 1965-10-18
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Granted: 1966-12-13
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Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Roy H Cullen
- 👤 Charles H Elliott
- 👤 Jimmie R Aker
- 👤 Thomas J Gilchrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:13
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A DRILLING APPARATUS, COMPRISING: (A) A TUBULAR BODY ADAPTED TO BE SUPPORTED IN A WELL BORE, (B) UPPER AND LOWER SEAL MEANS IN SAID BODY FOR CONFINING OIL THEREIN TO FORM AN OIL CHAMBER, (C) A FLEXIBLE SLEEVE IN SAID BODY BETWEEN SAID LOWER SEAL MEANS AND SAID UPPER SEAL MEANS, (D) SAID FLEXIBLE SLEEVE FORMING AT LEAST A PORTION OF THE WALL OF THE OIL CHAMBER, AND (E) MEANS ESTABLISHING COMMUNICATION BETWEEN THE AREA IN SAID BODY EXTERNALLY OF SAID FLEXIBLE SLEEVE AND THE AREA EXTERNALLY OF SAID BODY FOR EXPOSING THE FLEXIBLE SLEEVE AND THE OIL THEREIN TO THE PRESSUER OF THE FLUID IN THE AREA EXTERNALLY OF SAID BODY TO SUBSTANTIALLY EQUALIZE THE PRESSURE OF SAID OIL WITH THAT OF SAID FLUID.
Claim 2
Dependent Claim
125 words
A DRILLING APPARATUS, COMPRISING: (A) A TUBULAR BODY ADAPTED TO BE SUPPORTED IN A WELL BORE, (B) UPPER AND LOWER SEAL MEANS IN SAID BODY FOR CONFINING OIL THEREIN TO FORM AN OIL CHAMBER, (C) A FLEXIBLE SLEEVE IN SAID BODY BETWEEN SAID LOWER SEAL MEANS AND SAID UPPER SEAL MEANS, (D) SAID FLEXIBLE SLEEVE FORMING AT LEAST A PORTION OF THE WALL OF THE OIL CHAMBER, AND (E) MEANS ESTABLISHING COMMUNICATION BETWEEN THE AREA IN SAID BODY EXTERNALLY OF SAID FLEXIBLE SLEEVE AND THE AREA EXTERNALLY OF SAID BODY FOR EXPOSING THE FLEXIBLE SLEEVE AND THE OIL THEREIN TO THE PRESSUER OF THE FLUID IN THE AREA EXTERNALLY OF SAID BODY TO SUBSTANTIALLY EQUALIZE THE PRESSURE OF SAID OIL WITH THAT OF SAID FLUID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |