US3351136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing centralizer and well bore wiper
Assignee: Individual
•
Filing: 1964-09-14
•
Granted: 1967-11-07
•
Expires: 1984-09-14
Abstract
No abstract record available.
Inventors
- 👤 Fred B Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:02
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/105; E21B17/1035; E21B17/22; E21B31/00; E21B31/035; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN COMBINATION WITH A WELL CASING ROTATABLY EXTENDED INTO A WELL BORE A CENTRALIZING AND BORE WIPING ELEMENT COMPRISING A STRIP OF RESILIENT MATERIAL EXTENDING LONGITUDINALLY OF THE CASING HAVING A BASE PORTION POSITIONED IN CONTACT WITH THE EXTERNAL SURFACE OF THE CASING AND A WIPER PORTION OF REDUCED THICKNESS EXTENDING AWAY FROM THE CASING FOR WIPING CONTACT WITH THE SURROUNDING WALL OF THE BORE, SAID ELEMENT HAVING AN EXTERNAL LONGITUDINAL GROOVE FORMED THEREIN, AN ELONGATED METALLIC REINFORCING ELEMENT LOCATED IN SAID GROOVE AND MEANS SURROUNDING THE CASING AND EXTENDING OVER SAID ELEMENT OVER SAID GROOVE TO SECURE THE ELEMENT AND MEMBER TO THE CASING.
Claim 2
Dependent Claim
105 words
IN COMBINATION WITH A WELL CASING ROTATABLY EXTENDED INTO A WELL BORE A CENTRALIZING AND BORE WIPING ELEMENT COMPRISING A STRIP OF RESILIENT MATERIAL EXTENDING LONGITUDINALLY OF THE CASING HAVING A BASE PORTION POSITIONED IN CONTACT WITH THE EXTERNAL SURFACE OF THE CASING AND A WIPER PORTION OF REDUCED THICKNESS EXTENDING AWAY FROM THE CASING FOR WIPING CONTACT WITH THE SURROUNDING WALL OF THE BORE, SAID ELEMENT HAVING AN EXTERNAL LONGITUDINAL GROOVE FORMED THEREIN, AN ELONGATED METALLIC REINFORCING ELEMENT LOCATED IN SAID GROOVE AND MEANS SURROUNDING THE CASING AND EXTENDING OVER SAID ELEMENT OVER SAID GROOVE TO SECURE THE ELEMENT AND MEMBER TO THE CASING.
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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) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |