Patent US3174500A successfully refreshed from Google Patents.
US3174500A
Expired / Lapsed
US
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Snap acting accumulator charging valve
Assignee: Caterpillar Inc
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Filing: 1962-06-29
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Granted: 1965-03-23
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 Gordon W Johnson
- 👤 Kenneth R Lohbauer
- 👤 Donald L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:21
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/027; C; C01; C01G; C01G43/00; C01G43/04; C01G43/06; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607; Y10T137/265; Y10T137/2668; Y10T137/2693; Y10T137/2695
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
IN A FLUID SYSTEM HAVING AN ACCUMULATOR, A SOURCE OF CHARGING FLUID THEREFOR AND A CHARGING VALVE, THE COMBINATION COMPRISING: A VALVE HOUSING IN FLUID COMMUNICATION BETWEEN THE SOURCE OF CHARGING FLUID, THE ACCUMULATOR AND A DISCHARGE LINE; A SINGLE VALVE SPOOL SLIDABLY DISPOSED IN A VALVE BORE IN SAID HOUSING, SAID SPOOL HAVING A FIRST POSITION WITHIN THE BORE IN WHICH COMMUNICATION BETWEEN THE SOURCE OF CHARGING FLUID AND THE ACCUMULATOR IS ESTABLISHED THROUGH THE BORE AND THE DISCHARGE LINE IS BLOCKED, AND A SECOND POSITION IN THE OPPOSITE DIRECTION IN THE BORE IN WHICH THE SOURCE OF CHARGING FLUID IS BLOCKED FROM THE ACCUMULATORAND ESTABLISHED TO THE DISCHARGE LINE; SPRING MEANS ACTING DIRECTLY ON SAID SPOOL AND URGING SAID SPOOL TOWARD THE FIRST COMMUNICATING POSITION WITH A CONSTANT FORCE; FLUID PRESSURE RESPONSIVE MEANS IN COMMUNICATION WITH SAID ACCUMULATOR ACTING DIRECTLY ON SAID SPOOL AND URGING SAID SPOOL IN OPPOSITE TO SAID FIRST MEANS AND THUS TOWARD THE POSITION IN WHICH THE SOURCE OF CHARGING FLUID IS BLOCKED FROM THE ACCUMULATOR; AND THIRD MEANS POVIDING A CONSTANT FORCE OPPOSING BOTH OF SAID MEANS.
Claim 2
Dependent Claim
184 words
IN A FLUID SYSTEM HAVING AN ACCUMULATOR, A SOURCE OF CHARGING FLUID THEREFOR AND A CHARGING VALVE, THE COMBINATION COMPRISING: A VALVE HOUSING IN FLUID COMMUNICATION BETWEEN THE SOURCE OF CHARGING FLUID, THE ACCUMULATOR AND A DISCHARGE LINE; A SINGLE VALVE SPOOL SLIDABLY DISPOSED IN A VALVE BORE IN SAID HOUSING, SAID SPOOL HAVING A FIRST POSITION WITHIN THE BORE IN WHICH COMMUNICATION BETWEEN THE SOURCE OF CHARGING FLUID AND THE ACCUMULATOR IS ESTABLISHED THROUGH THE BORE AND THE DISCHARGE LINE IS BLOCKED, AND A SECOND POSITION IN THE OPPOSITE DIRECTION IN THE BORE IN WHICH THE SOURCE OF CHARGING FLUID IS BLOCKED FROM THE ACCUMULATORAND ESTABLISHED TO THE DISCHARGE LINE; SPRING MEANS ACTING DIRECTLY ON SAID SPOOL AND URGING SAID SPOOL TOWARD THE FIRST COMMUNICATING POSITION WITH A CONSTANT FORCE; FLUID PRESSURE RESPONSIVE MEANS IN COMMUNICATION WITH SAID ACCUMULATOR ACTING DIRECTLY ON SAID SPOOL AND URGING SAID SPOOL IN OPPOSITE TO SAID FIRST MEANS AND THUS TOWARD THE POSITION IN WHICH THE SOURCE OF CHARGING FLUID IS BLOCKED FROM THE ACCUMULATOR; AND THIRD MEANS POVIDING A CONSTANT FORCE OPPOSING BOTH OF SAID MEANS.
References Cited (Backward Citations)
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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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |