US3279266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well pumping apparatus having improved counterbalance means
Assignee: HARRIETTE E DOBBS
•
Filing: 1964-02-21
•
Granted: 1966-10-18
•
Expires: 1984-02-21
Abstract
No abstract record available.
Inventors
- 👤 Richard H Dobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18152; Y10T74/21; Y10T74/2142; Y10T74/2154; Y10T74/2156
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN OIL WELL PUMPING APPARATUS INCLUDING A CABLE ATTACHED TO A VERTICALLY RECIPROCATIVE POLISH ROD, AND A MOVABLE, ENDLESS DRIVE CHAIN HAVING A FIRST STRETCH EXTENDING ALONG THE VERTICAL AND A SECOND STRETCH INCLINED RELATIVE TO SAID FIRST STRETCH, THE COMBINATION WITH SAID CHAIN AND CABLE OF: A COUNTERWEIGHT; MEANS CONNECTING THE COUNTERWEIGHT TO SAID CHAIN FOR MOVEMENT THEREWITH, SAID CABLE BEING COUPLED WITH AND EXTENDING UPWARDLY FROM SAID COUNTERWEIGHT, SAID CABLE AND THE LINE OF ACTION OF THE WEIGHT OF SAID COUNTERWEIGHT BEING SUBSTANTIALLY COPLANAR WITH SAID STRETCH OF THE CHAIN AS SAID CONNECTING MEANS MOVES ALONG SAID STRETCH, WHEREBY SAID COUNTERWEIGHT WILL BE UTILIZED SOLELY FOR APPLYING A SUBSTANTIALLY RECTILINEAR FORCE TO THE CABLE WHEN THE CONNECTING MEANS MOVES DOWNWARDLY ALONG SAID STRETCH; AND AN INCLINED GUIDE ADJACENT THE SECOND STRETCH OF THE CHAIN AND DISPOSED TO PARTIALLY SUPPORT SAID COUNTERWEIGHT AS THE CONNECTING MEANS MOVES ALONG SAID SECOND STRETCH.
Claim 2
Dependent Claim
152 words
IN OIL WELL PUMPING APPARATUS INCLUDING A CABLE ATTACHED TO A VERTICALLY RECIPROCATIVE POLISH ROD, AND A MOVABLE, ENDLESS DRIVE CHAIN HAVING A FIRST STRETCH EXTENDING ALONG THE VERTICAL AND A SECOND STRETCH INCLINED RELATIVE TO SAID FIRST STRETCH, THE COMBINATION WITH SAID CHAIN AND CABLE OF: A COUNTERWEIGHT; MEANS CONNECTING THE COUNTERWEIGHT TO SAID CHAIN FOR MOVEMENT THEREWITH, SAID CABLE BEING COUPLED WITH AND EXTENDING UPWARDLY FROM SAID COUNTERWEIGHT, SAID CABLE AND THE LINE OF ACTION OF THE WEIGHT OF SAID COUNTERWEIGHT BEING SUBSTANTIALLY COPLANAR WITH SAID STRETCH OF THE CHAIN AS SAID CONNECTING MEANS MOVES ALONG SAID STRETCH, WHEREBY SAID COUNTERWEIGHT WILL BE UTILIZED SOLELY FOR APPLYING A SUBSTANTIALLY RECTILINEAR FORCE TO THE CABLE WHEN THE CONNECTING MEANS MOVES DOWNWARDLY ALONG SAID STRETCH; AND AN INCLINED GUIDE ADJACENT THE SECOND STRETCH OF THE CHAIN AND DISPOSED TO PARTIALLY SUPPORT SAID COUNTERWEIGHT AS THE CONNECTING MEANS MOVES ALONG SAID SECOND STRETCH.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |