US3139760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-stroke drive mechanism
Assignee: Pure Oil Co
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Filing: 1960-11-25
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Granted: 1964-07-07
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Expires: 1980-11-25
Abstract
No abstract record available.
Inventors
- 👤 Paul E Pfeifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:53
CPC Classifications
F; F16; F16C; F16C7/00; F16C7/06; F16H; F16H21/00; F16H21/06; F16H21/08; F16H21/10; F16H21/16; F16H21/18; F16H21/20; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18208; Y10T74/21; Y10T74/2142; Y10T74/2144; Y10T74/2147; Y10T74/2151
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A MECHANISM COMPRISING A PISTON AND A CRANK MECHANICALLY CONNECTED TO SAID PISTON FOR IMPARTING RECIPROCATING MOTION TO SAID PISTON, THE IMPROVEMENT WHEREIN SAID CRANK AND PISTON ARE MECHANICALLY CONNECTED BY A CONNECTING LINK COMPRISING A TUBE, A ROD EXTENDING AXIALLY OF SAID TUBE, A PLUNGER MEMBER CONNECTED TO SAID ROD AND DISPOSED WITHIN SAID TUBE IN SPACED RELATIONSHIP THEREWITH, A FIELD-RESPONSIVE FLUID DISPOSED IN THE SPACE BETWEEN SAID TUBE AND PLUNGER, MEANS FOR GUIDING AXIAL MOVEMENT OF SAID PLUNGER WITH RESPECT TO SAID TUBE, THE MUTUALLY REMOTE ENDS OF SAID ROD AND TUBE BEING ATTACHED TO SAID CRANK AND PISTON TO MECHANICALLY CONNECT SAID CRANK AND PISTON, CIRCUIT MEANS FOR APPLYING A FIELD OF CONSTANT MAGNITUDE TRANSVERSELY OF SAID SPACE BETWEEN SAID PLUNGER AND TUBE, AND MEANS RESPONSIVE TO THE POSITION OF SAID CRANK FOR REDUCING THE MAGNITUDE OF SAID FIELD DURING A PORTION OF THE CYCLE OF SAID CRANK.
Claim 2
Dependent Claim
152 words
IN A MECHANISM COMPRISING A PISTON AND A CRANK MECHANICALLY CONNECTED TO SAID PISTON FOR IMPARTING RECIPROCATING MOTION TO SAID PISTON, THE IMPROVEMENT WHEREIN SAID CRANK AND PISTON ARE MECHANICALLY CONNECTED BY A CONNECTING LINK COMPRISING A TUBE, A ROD EXTENDING AXIALLY OF SAID TUBE, A PLUNGER MEMBER CONNECTED TO SAID ROD AND DISPOSED WITHIN SAID TUBE IN SPACED RELATIONSHIP THEREWITH, A FIELD-RESPONSIVE FLUID DISPOSED IN THE SPACE BETWEEN SAID TUBE AND PLUNGER, MEANS FOR GUIDING AXIAL MOVEMENT OF SAID PLUNGER WITH RESPECT TO SAID TUBE, THE MUTUALLY REMOTE ENDS OF SAID ROD AND TUBE BEING ATTACHED TO SAID CRANK AND PISTON TO MECHANICALLY CONNECT SAID CRANK AND PISTON, CIRCUIT MEANS FOR APPLYING A FIELD OF CONSTANT MAGNITUDE TRANSVERSELY OF SAID SPACE BETWEEN SAID PLUNGER AND TUBE, AND MEANS RESPONSIVE TO THE POSITION OF SAID CRANK FOR REDUCING THE MAGNITUDE OF SAID FIELD DURING A PORTION OF THE CYCLE OF SAID CRANK.
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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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |