Patent US3329211A successfully refreshed from Google Patents.
US3329211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paraffin control device
Assignee: Individual
•
Filing: 1964-06-24
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Granted: 1967-07-04
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Expires: 1984-06-24
Abstract
No abstract record available.
Inventors
- 👤 Erskine E Roach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:05
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02; E21B37/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
129 words
A PARAFFIN CONTROL DEVICE FOR WELL PIPES, COMPRISING, A GENERALLY TUBULAR BODY INSERTABLE IN A WELL PIPE FOR LONGITUDINAL MOVEMENT THEREIN, MEANS CARRIED BY THE BODY FOR CONTROLLING PARAFFIN TENDING TO ADHERE TO THE WALL OF SAID PIPE, AND MEANS FOR INCREASING THE EFFECTIVE BUOYANCY OF SAID BODY IN WELL FLUIDS PRESENT IN SAID PIPE COMPRISING AN ELONGATE HOLLOW BODY PORTION DEFINING A BUOYANCY CHAMBER, SAID BODY PORTION HAVING LONGITUDINALLY SPACED UPPER AND LOWER OPENINGS THEREIN FOR PASSAGE OF WELL FLUIDS THROUGH SAID CHAMBER, AND MEANS CARRIED BY SAID BODY OPERABLE TO CLOSE AND UPPER OPENINGS WITHOUT CLOSING SAID LOWER OPENINGS WHEN SAID BODY IS AT A LOW POINT IN ITS TRAVEL IN SAID WELL PIPE WHEREBY TO TRAP GASIFORM FLUID EVOLVED IN SAID CHAMBER FROM SAID WELL FLUIDS.
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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |