US2728400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for preventing corrosion in oil wells
Assignee: California Research LLC
•
Filing: 1952-07-22
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Granted: 1955-12-27
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Expires: 1972-07-22
Abstract
No abstract record available.
Inventors
- 👤 Gilson H Rohrback
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:26
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
FOR USE IN DISSOLVING A SOLUBLE SOLID INTO A WELL, THE COMBINATION COMPRISING A CONTAINER HAVING A CLOSED UPPER END AND AN OPEN LOWER END, A SUPPORT AFFIXED TO SAID CONTAINER, A METAL MEMBER RESTING ON SAID SUPPORT, A PLURALITY OF BIMETALLIC JOINTS ON SAID MEMBER, A BLOCK OF SAID SOLID SLIDABLY DISPOSED WITHIN SAID CONTAINER AND RIGIDLY AFFIXED TO SAID MEMBER, ONE BIMETALLIC JOINT BEING EXPOSED TO WELL FLUIDS.
Claim 2
Dependent Claim
70 words
FOR USE IN DISSOLVING A SOLUBLE SOLID INTO A WELL, THE COMBINATION COMPRISING A CONTAINER HAVING A CLOSED UPPER END AND AN OPEN LOWER END, A SUPPORT AFFIXED TO SAID CONTAINER, A METAL MEMBER RESTING ON SAID SUPPORT, A PLURALITY OF BIMETALLIC JOINTS ON SAID MEMBER, A BLOCK OF SAID SOLID SLIDABLY DISPOSED WITHIN SAID CONTAINER AND RIGIDLY AFFIXED TO SAID MEMBER, ONE BIMETALLIC JOINT BEING EXPOSED TO WELL FLUIDS.
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) | 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 |