US2829099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mitigating corrosion in oil well casing
Assignee: Pure Oil Co
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Filing: 1954-12-29
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Granted: 1958-04-01
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Expires: 1974-12-29
Abstract
No abstract record available.
Inventors
- 👤 Glenn A Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:23
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/02; C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; C23F13/08; C23F13/18; C23F2213/00; C23F2213/30; C23F2213/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
THE COMBINATION WITH A METAL CONDUIT OF A CATHODIC PROTECTION DEVICE FOR MITIGATING CORROSION THEREIN, SAID CATHODIC PROTECTION DEVICE COMPRISING A SACRIFICIAL ANODE OF A METAL LESS NOBLE THAN SAID CONDUIT, SAID ANODE BEING ANNULAR IN SHAPE WITH AN INITIAL EXPANDED FORM PROVIDING AN OUTER SURFACE SLIGHTLY LARGER IN DIAMETER THAN THE INSIDE DIAMETER OF SAID METAL CONDUIT AND HAVING A SINGLE SLOT COMPLETELY THROUGH THE WALL THEREOF PERMITTING THE SAME TO BE COMPRESSED TO A SIZE FITTING WITHIN SAID CONDUIT, AN EXPANSIBLE SPLIT ANNULAR SPRING SHEATH OF ANGULAR CROSS SECTION FITTED WITHIN SAID ANODE AND HAVING ONE WALL PORTION CONTIGUOUS WITH AN ANNULAR PORTION OF THE INNER WALL AND ANOTHER WALL PORTION CONTIGUOUS WITH AN ANNULAR END WALL OF SAID ANODE, AND SAID SPRING SHEATH EXPANDING SAID ANODE TO DEFORM THE SAME AND EFFECT A TIGHT CONTACT WITH THE INNER SURFACE OF SAID METAL CONDUIT.
Claim 2
Dependent Claim
146 words
THE COMBINATION WITH A METAL CONDUIT OF A CATHODIC PROTECTION DEVICE FOR MITIGATING CORROSION THEREIN, SAID CATHODIC PROTECTION DEVICE COMPRISING A SACRIFICIAL ANODE OF A METAL LESS NOBLE THAN SAID CONDUIT, SAID ANODE BEING ANNULAR IN SHAPE WITH AN INITIAL EXPANDED FORM PROVIDING AN OUTER SURFACE SLIGHTLY LARGER IN DIAMETER THAN THE INSIDE DIAMETER OF SAID METAL CONDUIT AND HAVING A SINGLE SLOT COMPLETELY THROUGH THE WALL THEREOF PERMITTING THE SAME TO BE COMPRESSED TO A SIZE FITTING WITHIN SAID CONDUIT, AN EXPANSIBLE SPLIT ANNULAR SPRING SHEATH OF ANGULAR CROSS SECTION FITTED WITHIN SAID ANODE AND HAVING ONE WALL PORTION CONTIGUOUS WITH AN ANNULAR PORTION OF THE INNER WALL AND ANOTHER WALL PORTION CONTIGUOUS WITH AN ANNULAR END WALL OF SAID ANODE, AND SAID SPRING SHEATH EXPANDING SAID ANODE TO DEFORM THE SAME AND EFFECT A TIGHT CONTACT WITH THE INNER SURFACE OF SAID METAL CONDUIT.
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) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |