Patent US3176771A successfully refreshed from Google Patents.
US3176771A
Expired / Lapsed
US
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Mud scraper
Assignee: Individual
•
Filing: 1962-11-28
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Granted: 1965-04-06
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Expires: 1982-11-28
Abstract
No abstract record available.
Inventors
- 👤 Marshall L Claiborne
- 👤 Edward G Durrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:43
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
A MUD SCRAPER MOUNTED ON CASING COMPRISING: (A) AN UPPER SPIRAL MEMBER SURROUNDING THE CASING, (B) THE UPPER SPIRAL MEMBER HAVING HELICAL VANES EXTENDING RADIALLY OUTWARD FROM THE CASING, (C) THE UPPER SPIRAL MEMBER MOUNTED FOR FREE ROTATIONAL MOVEMENT ON THE CASING, (D) THE UPPER SPIRAL MEMBER MOUNTED FOR LIMITED TRANSLATIONAL MOVEMENT OF THE CASING, AND (E) A LOWER SPIRAL MEMBER SURROUNDING THE CASING, (F) THE LOWER SPIRAL MEMBER HAVING HELICAL VANES EXTENDING RADIALLY OUTWARD FROM THE CASING WHICH ROTATE AROUND THE CASING IN THE OPPOSITE DIRECTION THAN THE VANES OF THE UPPER SPIRAL MEMBER, (G) THE LOWER SPIRAL MEMBER MOUNTED FOR FREE ROTATIONAL MOVEMENT ON THE CASING, AND (H) THE LOWER SPIRAL MEMBER MOUNTED FOR LIMITED TRANSLATIONAL MOVEMENT ON THE CASING.
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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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |