US3357494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scratcher attachment for oil well casing
Assignee: Individual
•
Filing: 1964-12-07
•
Granted: 1967-12-12
•
Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 Sr Benson H Bolding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:42
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
AN OIL WET CASING CENTRALIZER AND SCRATCHER COMPRISING AT LEAST ONE STRIP HAVING A LONGITUDINALLY OUTWARDLY DIRECTED SEMI-CIRCULAR CENTRAL PORTION, SAID STRIP RETAINED LONGITUDINALLY ALONG THE EXTERIOR SURFACE OF SAID OIL WELL CASING AND ENCIRCLING SAID CASING HELICALLY FOR NOT MORE THAN ONE REVOLUTION, SAID STRIP HAVING PAIRS OF OPENINGS SPACED PERIODICALLY LONGITUDINALLY ALONG SAID STRIP, EACH PAIR COMPRISING A FIRST OPENING ON ONE SIDE OF SAID CENTRAL PORTION AND A SECOND OPENING ON THE OTHER SIDE OF SAID CENTRAL PORTION, SAID OPENINGS POSITIONED BELOW THE TOP OF SAID CENTRAL PORTION ADJACENT THE JUNCTION OF SAID CENTRAL PORTION AND SAID STRIP, AND
Claim 2
Dependent Claim
102 words
AN OIL WET CASING CENTRALIZER AND SCRATCHER COMPRISING AT LEAST ONE STRIP HAVING A LONGITUDINALLY OUTWARDLY DIRECTED SEMI-CIRCULAR CENTRAL PORTION, SAID STRIP RETAINED LONGITUDINALLY ALONG THE EXTERIOR SURFACE OF SAID OIL WELL CASING AND ENCIRCLING SAID CASING HELICALLY FOR NOT MORE THAN ONE REVOLUTION, SAID STRIP HAVING PAIRS OF OPENINGS SPACED PERIODICALLY LONGITUDINALLY ALONG SAID STRIP, EACH PAIR COMPRISING A FIRST OPENING ON ONE SIDE OF SAID CENTRAL PORTION AND A SECOND OPENING ON THE OTHER SIDE OF SAID CENTRAL PORTION, SAID OPENINGS POSITIONED BELOW THE TOP OF SAID CENTRAL PORTION ADJACENT THE JUNCTION OF SAID CENTRAL PORTION AND SAID STRIP, AND
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) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |