Patent US3678811A successfully refreshed from Google Patents.
US3678811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well pump working barrel
Assignee: LANER GARY JOE
•
Filing: 1970-05-28
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Granted: 1972-07-25
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Expires: 1990-05-28
Abstract
Abstract A pumping well working barrel includes an outer polyvinyl chloride sleeve and an inner liner of stainless steel.
Inventors
- 👤 James T Penwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:51
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
In a subterranean oil well tubing working barrel within which a reciprocating pump plunger operates, the improvement of said barrel comprising: an outer tubular rigid synthetic plastic sleeve having means at is upper and lower ends thereon for threaded connection with said oil well tubing; an inner stainless steel liner disposed within and coaxial with said outer sleeve along its longitudinal length to form the inner periphery of said barrel, said inner liner adapted for reciprocally receiving said plunger of said pump.
Claim 2
Dependent Claim
82 words
In a subterranean oil well tubing working barrel within which a reciprocating pump plunger operates, the improvement of said barrel comprising: an outer tubular rigid synthetic plastic sleeve having means at is upper and lower ends thereon for threaded connection with said oil well tubing; an inner stainless steel liner disposed within and coaxial with said outer sleeve along its longitudinal length to form the inner periphery of said barrel, said inner liner adapted for reciprocally receiving said plunger of said pump.
Claim 3
Dependent Claim
16 words
A pump working barrel as in claim 1 wherein said outer plastic sleeve is polyvinyl chloride.
Claim 4
Dependent Claim
23 words
An apparatus as in claim 2 wherein the upper and lower inner ends of said sleeve and said inner liner are beveled outwardly.
References Cited (Backward Citations)
US1498806A
Cited
US2240121A
Cited
US2613958A
Cited
US2606574A
Cited
US3134305A
Cited
US3484539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |