Patent US3356147A successfully refreshed from Google Patents.
US3356147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centralizer device for casings in boreholes
Assignee: Individual
•
Filing: 1966-04-05
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Granted: 1967-12-05
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Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Dreyfuss Wilfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:52
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A CENTRALIZER OF THE TYPE HAVING SPACED, ALIGNED COLLARS AND CONNECTING BOWED ELEMENTS, COLLAR AND BOWED ELEMENT ATTACHING MEANS COMPRISING A RADIAL RECESS IN A LATERAL FACE OF THE COLLAR FORMING AXIALLY-SPACED, OPPOSING SHOULDERS, A GENERALLY U-SHAPED OFFSET IN THE END PORTION OF SAID BOWED ELEMENT NESTED IN SAID RECESS, AND A TONGUE PROJECTING FROM AT LEAST ONE SIDE EDGE OF SAID RECESS ACROSS SAID OFFSET AND CONFINING SAID ELEMENT IN SAID RECESS.
Claim 2
Dependent Claim
74 words
IN A CENTRALIZER OF THE TYPE HAVING SPACED, ALIGNED COLLARS AND CONNECTING BOWED ELEMENTS, COLLAR AND BOWED ELEMENT ATTACHING MEANS COMPRISING A RADIAL RECESS IN A LATERAL FACE OF THE COLLAR FORMING AXIALLY-SPACED, OPPOSING SHOULDERS, A GENERALLY U-SHAPED OFFSET IN THE END PORTION OF SAID BOWED ELEMENT NESTED IN SAID RECESS, AND A TONGUE PROJECTING FROM AT LEAST ONE SIDE EDGE OF SAID RECESS ACROSS SAID OFFSET AND CONFINING SAID ELEMENT IN SAID RECESS.
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |