US2733768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral paraffin scrapers
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
•
Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:25
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A REMOVABLE SPIRAL PARAFFIN SCRAPER ADAPTED TO FRICTIONALLY ENGAGE A SUCKER ROD WITHIN THE TUBING OF A WELL, SAID SCRAPER COMPRISING A BLADE OF SPRING MATERIAL HAVING OPPOSED NARROW EDGES AND BEING WOUND IN THE FORM OF A HELIX, SAID BLADE FRICTIONALLY ENGAGING SAID ROD ALONG ONE NARROW EDGE AND STANDING NORMAL TO SAID ROD ALONG THE FULLL LENGTH OF THE SCRAPER, THE SAID NARROW
Claim 2
Dependent Claim
65 words
A REMOVABLE SPIRAL PARAFFIN SCRAPER ADAPTED TO FRICTIONALLY ENGAGE A SUCKER ROD WITHIN THE TUBING OF A WELL, SAID SCRAPER COMPRISING A BLADE OF SPRING MATERIAL HAVING OPPOSED NARROW EDGES AND BEING WOUND IN THE FORM OF A HELIX, SAID BLADE FRICTIONALLY ENGAGING SAID ROD ALONG ONE NARROW EDGE AND STANDING NORMAL TO SAID ROD ALONG THE FULLL LENGTH OF THE SCRAPER, THE SAID NARROW
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) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |