Patent US4602807A successfully refreshed from Google Patents.
US4602807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rod coupling for oil well sucker rods and the like
Assignee: Individual
•
Filing: 1984-05-04
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Granted: 1986-07-29
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Expires: 2004-05-04
Abstract
Abstract A coupling for joining sucker rods in an oil well pump and the like, having a metal sleeve with an axially threaded bore and an exterior coating on the sleeve producing a cylindrical coupling, with the coating being an abrasive resistant thermoplastic hydrourethane polymer.
Inventors
- 👤 Rudy Bowers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:03
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1071; E21B17/02; E21B17/04; E21B17/042; E21B17/0426; F; F04; F04B; F04B53/00; F04B53/14; F04B53/144; F16; F16L; F16L57/00; F16L57/06; Y; Y10; Y10T; Y10T403/00; Y10T403/47; Y10T403/471; Y10T403/57; Y10T403/5746
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A coupling for joining solid reciprocating sucker rods to form a rod string in a well pump or the like comprising a unitary metal sleeve having an axial threaded bore and an irregular outer surface, and a homogeneous and non-fibrous coating on said sleeve over said outer surface providing an externally substantially cylindrical coupling, said coating comprising a flexible and abrasive resistant thermoplastic hydrourethane polymer formed on said irregular outer surface of said sleeve while in the molten state.
Claim 2
Dependent Claim
79 words
A coupling for joining solid reciprocating sucker rods to form a rod string in a well pump or the like comprising a unitary metal sleeve having an axial threaded bore and an irregular outer surface, and a homogeneous and non-fibrous coating on said sleeve over said outer surface providing an externally substantially cylindrical coupling, said coating comprising a flexible and abrasive resistant thermoplastic hydrourethane polymer formed on said irregular outer surface of said sleeve while in the molten state.
Claim 3
Dependent Claim
21 words
A coupling as defined in claim 1 wherein said metal sleeve irregular outer surface is in the form of a helix.
Claim 4
Dependent Claim
23 words
A coupling as defined in claim 1 wherein said metal sleeve irregular outer surface is in the form of a plurality of grooves.
Claim 5
Dependent Claim
31 words
A coupling as defined in claim 1 wherein said metal sleeve irregular outer surface is in the form of rims at opposite ends of said sleeve with a recessed portion therebetween.
Claim 6
Dependent Claim
110 words
A well pump rod string for reciprocating in a well casing, including in combination: a plurality of solid sucker rods with externally threaded ends; and a plurality of coupling members with internal threads, with adjacent sucker rods joined by threading the adjacent ends thereof into a coupling member to provide the rod string; with each of the coupling members comprising an internally threaded unitary metal sleeve with an irregular outer surface, and a homogeneous and non-fibrous coating on said sleeve over the outer surface providing a substantially cylindrical coupling, with the coating comprising a flexible and abrasive resistant thermoplastic hydrourethane polymer formed on the sleeve while in the molten state.
Claim 7
Dependent Claim
110 words
A well pump rod string for reciprocating in a well casing, including in combination: a plurality of solid sucker rods with externally threaded ends; and a plurality of coupling members with internal threads, with adjacent sucker rods joined by threading the adjacent ends thereof into a coupling member to provide the rod string; with each of the coupling members comprising an internally threaded unitary metal sleeve with an irregular outer surface, and a homogeneous and non-fibrous coating on said sleeve over the outer surface providing a substantially cylindrical coupling, with the coating comprising a flexible and abrasive resistant thermoplastic hydrourethane polymer formed on the sleeve while in the molten state.
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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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |