Patent US6134580A successfully refreshed from Google Patents.
Patent US3237696A successfully refreshed from Google Patents.
US3237696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well wall solidifying centralizer
Assignee: Trojan Inc
•
Filing: 1963-07-01
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Granted: 1966-03-01
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Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Sr Jesse E Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:39
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A CENTRALIZER FOR MOUNTING ON WELL CASING DURING WELL COMPLETION OPERATIONS COMPRISING UPPER AND LOWER COLLARS SLIDABLY FITTED TO THE EXTERIOR OF THE CASING, A PLURALITY OF BOWED SPRING MEMBERS SPANNING THE SPACE BETWEEN THE COLLARS, ONE END OF SAID MEMBERS ATTACHED TO THE UPPER COLLAR, THE OTHER END TO THE LOWER COLLAR, SAID MEMBERS EQUALLY SPACED CIRCUMFERENTIALLY, DIVERSION VANES EXTENDING UPWARDLY PART WAY BETWEEN THE COLLARS, THEIR LOWER EXTREMITIES ANCHORD TO THE LOWER COLLAR, THEIR UPPER FREE ENDS CONTOURED CEN-
Claim 2
Dependent Claim
81 words
A CENTRALIZER FOR MOUNTING ON WELL CASING DURING WELL COMPLETION OPERATIONS COMPRISING UPPER AND LOWER COLLARS SLIDABLY FITTED TO THE EXTERIOR OF THE CASING, A PLURALITY OF BOWED SPRING MEMBERS SPANNING THE SPACE BETWEEN THE COLLARS, ONE END OF SAID MEMBERS ATTACHED TO THE UPPER COLLAR, THE OTHER END TO THE LOWER COLLAR, SAID MEMBERS EQUALLY SPACED CIRCUMFERENTIALLY, DIVERSION VANES EXTENDING UPWARDLY PART WAY BETWEEN THE COLLARS, THEIR LOWER EXTREMITIES ANCHORD TO THE LOWER COLLAR, THEIR UPPER FREE ENDS CONTOURED CEN-
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |