US3312285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well pipe centralizer
Assignee: B&W Inc
•
Filing: 1966-02-02
•
Granted: 1967-04-04
•
Expires: 1986-02-02
Abstract
No abstract record available.
Inventors
- 👤 James R Solum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:19
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
134 words
A WELL PIPE CENTRALIZER FOR RESILIENTLY CENTERING A WELL PIPE WITHIN A WELL BORE, COMPRISED OF A PAIR OF SPACED AND ALIGNED COLLARS ADAPTED TO FIT THE WELL PIPE AND A PLURALITY OF CIRCUMFERENTIALLY SPACED RIBS EXTENDING BETWEEN SAID COLLARS, SAID RIBS INTEGRAL WITH AND OF THE SAME BLANK OF MATERIAL AS SAID COLLARS, SAID RIBS AND COLLARS BEING OF A HEAT TREATABLE SPRING STEEL, AT LEAST SOME OF SAID RIBS BOWED OUTWARDLY BETWEEN SAID COLLARS AND BEING HEAT TREATED TO SPRING CHARACTERISTICS FOR ENGAGING THE WELL BORE TO RESILIENTLY CENTER THE WELL PIPE, AND AT LEAST ONE OTHER OF SAID RIBS HAVING A PROFILE DIFFERENT FROM THE SAID OUTWARDLY BOWED RIBS WITH SUCH DIFFERENT PROFILE INCLUDING A LONGITUDINALLY CENTRAL PORTION POSITIONED INWARDLY OF SAID COLLARS FOR ENGAGING THE EXTERIOR OF THE WELL PIPE.
References Cited (Backward Citations)
US1394925A
Cited
US1664669A
Cited
US1775376A
Cited
US1991988A
Cited
US2009496A
Cited
US2258052A
Cited
US2311768A
Cited
US2659439A
Cited
US2622684A
Cited
US2636564A
Cited
US2727576A
Cited
US2927953A
Cited
US3177946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |