Patent US3221502A successfully refreshed from Google Patents.
US3221502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control master cylinder
Assignee: Motors Liquidation Co
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Filing: 1964-03-23
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Granted: 1965-12-07
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Expires: 1984-03-23
Abstract
No abstract record available.
Inventors
- 👤 Ronald L Shellhause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:43
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A MASTER CYCLINDER FOR FLUID PRESSURE PRODUCING APPARATUS, SAID MASTER CYLINDER COMPRISING: FLUID STORAGE MEANS, FLUID DISPLACING MEANS IN FLUID COMMUNICATION WITH SAID FLUID STORAGE MEANS AND ADAPTED TO DRAW FLUID THEREFROM, FIRST MEANS FOR DIRECTING FLUID PRESSURE FROM THE FLUID DISPLACING MEANS TO A FLUID OPERABLE SYSTEM, AND VALVE MEANS DISPOSED WITHIN SAID FIRST MEANS AND INCLUDING AN UNRESTRAINED DISPLACEABLE ELEMENT THEREIN ADAPTED TO SELECTIVELY ISOLATE THE FLUID STORAGE MEANS FROM THE FLUID PRESSURE PRODUCING APPARATUS AND BRING SAID FLUID PRESSURE PRODUCING APPARATUS INTO FLUID COMMUNICATION WITH SAID FLUID OPERABLE SYSTEM DURING PERIODS OF PRESSURE DEVELOPMENT, SAID VALVE MEANS ARRANGED TO PASS FLUID FROM THE FLUID STORAGE MEANS INTO THE FLUID PRESSURE PRODUCING APPARATUS AS THE FLUID QUANTITY THEREIN BECOMES DEPLETED IN RESPONSE TO A NEGATIVE PRESSURE IN SAID FLUID DISPLACING MEANS, SAID VALVE MEANS ARRANGED TO SHUT OFF FLUID FLOW FROM SAID FLUID STORAGE MEANS TO THE FLUID DISPLACING MEANS AS THE NEED THEREIN IS SATISFIED.
Claim 2
Dependent Claim
158 words
A MASTER CYCLINDER FOR FLUID PRESSURE PRODUCING APPARATUS, SAID MASTER CYLINDER COMPRISING: FLUID STORAGE MEANS, FLUID DISPLACING MEANS IN FLUID COMMUNICATION WITH SAID FLUID STORAGE MEANS AND ADAPTED TO DRAW FLUID THEREFROM, FIRST MEANS FOR DIRECTING FLUID PRESSURE FROM THE FLUID DISPLACING MEANS TO A FLUID OPERABLE SYSTEM, AND VALVE MEANS DISPOSED WITHIN SAID FIRST MEANS AND INCLUDING AN UNRESTRAINED DISPLACEABLE ELEMENT THEREIN ADAPTED TO SELECTIVELY ISOLATE THE FLUID STORAGE MEANS FROM THE FLUID PRESSURE PRODUCING APPARATUS AND BRING SAID FLUID PRESSURE PRODUCING APPARATUS INTO FLUID COMMUNICATION WITH SAID FLUID OPERABLE SYSTEM DURING PERIODS OF PRESSURE DEVELOPMENT, SAID VALVE MEANS ARRANGED TO PASS FLUID FROM THE FLUID STORAGE MEANS INTO THE FLUID PRESSURE PRODUCING APPARATUS AS THE FLUID QUANTITY THEREIN BECOMES DEPLETED IN RESPONSE TO A NEGATIVE PRESSURE IN SAID FLUID DISPLACING MEANS, SAID VALVE MEANS ARRANGED TO SHUT OFF FLUID FLOW FROM SAID FLUID STORAGE MEANS TO THE FLUID DISPLACING MEANS AS THE NEED THEREIN IS SATISFIED.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |