US3404877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorber
Assignee: WILLIAM J DARNELL
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Filing: 1966-06-20
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Granted: 1968-10-08
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Expires: 1986-06-20
Abstract
No abstract record available.
Inventors
- 👤 William J Darnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:20
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/144; F04B53/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A SHOCK ABSORBER FOR OIL WELL PUMPING EQUIPMENT COMPRISING: A BASE PLATE SUPPORTABLE BY HANGER RODS, SAID BASE PLATE HAVING A SUBSTANTIALLY CENTRAL POLISH ROD OPENING THERETHROUGH AND A COUNTERBORE ON AN UPPER SIDE OF SAID PLATE COAXIAL WITH SAID OPENING, SAID COUNTERBORE OF SAID BASE PLATE DEFINING A CONICAL SECTION; A FIRST CYLINDRICAL MEMBER HAVING A POLISH ROD OPENING IN A LOWER END THEREOF AND A FLANGE PORTION ADJACENT SAID OPENING, SAID FLANGE PORTION ABUTTABLE AGAINST SAID COUNTERBORE AND ENCIRCLING SAID POLISH ROD OPENING AND DEFINING A CONCIAL SECTION TO ABUT WITHIN SAID COUNTERBORE CONICAL SECTION; A SECOND CYLINDRICAL MEMBER SLIDABLY POSITIONABLE UPON SAID FIRST CYLINDRICAL MEMBER, SAID SECOND CYLINDRICAL MEMBER HAVING A POLISH ROD OPENING IN AN UPPER END THEREOF; AND A COIL SPRING MEMBER WITHIN SAID FIRST AND SAID SECOND CYLINDRICAL MEMBERS, SAID SPRING ALSO COAXIAL WITH SAID POLISH ROD OPENING IN SAID FIRST CYLINDRICAL MEMBER AND SAID POLISH ROD OPENING IN SAID SECOND CYLINDRICAL MEMBER.
Claim 2
Dependent Claim
159 words
A SHOCK ABSORBER FOR OIL WELL PUMPING EQUIPMENT COMPRISING: A BASE PLATE SUPPORTABLE BY HANGER RODS, SAID BASE PLATE HAVING A SUBSTANTIALLY CENTRAL POLISH ROD OPENING THERETHROUGH AND A COUNTERBORE ON AN UPPER SIDE OF SAID PLATE COAXIAL WITH SAID OPENING, SAID COUNTERBORE OF SAID BASE PLATE DEFINING A CONICAL SECTION; A FIRST CYLINDRICAL MEMBER HAVING A POLISH ROD OPENING IN A LOWER END THEREOF AND A FLANGE PORTION ADJACENT SAID OPENING, SAID FLANGE PORTION ABUTTABLE AGAINST SAID COUNTERBORE AND ENCIRCLING SAID POLISH ROD OPENING AND DEFINING A CONCIAL SECTION TO ABUT WITHIN SAID COUNTERBORE CONICAL SECTION; A SECOND CYLINDRICAL MEMBER SLIDABLY POSITIONABLE UPON SAID FIRST CYLINDRICAL MEMBER, SAID SECOND CYLINDRICAL MEMBER HAVING A POLISH ROD OPENING IN AN UPPER END THEREOF; AND A COIL SPRING MEMBER WITHIN SAID FIRST AND SAID SECOND CYLINDRICAL MEMBERS, SAID SPRING ALSO COAXIAL WITH SAID POLISH ROD OPENING IN SAID FIRST CYLINDRICAL MEMBER AND SAID POLISH ROD OPENING IN SAID SECOND CYLINDRICAL MEMBER.
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |