Patent US2722799A successfully refreshed from Google Patents.
US3209836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strong bow centralizer
Assignee: Trojan Inc
•
Filing: 1963-02-01
•
Granted: 1965-10-05
•
Expires: 1983-02-01
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 22:24
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A CENTRALIZER CONSTRUCTION COMPRISING AN UPPER AND A LOWER COLLAR ADAPTED TO FIT ON A WELL BORE PIPE OR CASING, A PLURALITY OF ELONGATE STRIPS HAVING SUBSTANTIALLY PARALLEL LONGITUDINAL EDGES CONNECTING THE UPPER AND LOWER COLLARS AND SPACING THEM APART FROM ONE ANOTHER, SAID STRIPS OUTWARDLY BOWED INTERMEDIATE OF THEIR ENDS AND CONNECTED TO SAID COLLARS ADJACENT THEIR ENDS, SAID STRIPS ARCUATELY FORMED OUTWARDLY IN TRANSVERSE CROSS SECTION INWARDLY OF THE SAID SUBSTANTIALLY PARALLEL LONGITUDINAL EDGES THEREOF.
Claim 2
Dependent Claim
77 words
A CENTRALIZER CONSTRUCTION COMPRISING AN UPPER AND A LOWER COLLAR ADAPTED TO FIT ON A WELL BORE PIPE OR CASING, A PLURALITY OF ELONGATE STRIPS HAVING SUBSTANTIALLY PARALLEL LONGITUDINAL EDGES CONNECTING THE UPPER AND LOWER COLLARS AND SPACING THEM APART FROM ONE ANOTHER, SAID STRIPS OUTWARDLY BOWED INTERMEDIATE OF THEIR ENDS AND CONNECTED TO SAID COLLARS ADJACENT THEIR ENDS, SAID STRIPS ARCUATELY FORMED OUTWARDLY IN TRANSVERSE CROSS SECTION INWARDLY OF THE SAID SUBSTANTIALLY PARALLEL LONGITUDINAL EDGES THEREOF.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |