Patent US3210941A successfully refreshed from Google Patents.
US3210941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure proportioning master cylinder
Assignee: ZF Active Safety US Inc
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Filing: 1965-01-11
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Granted: 1965-10-12
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Expires: 1985-01-11
Abstract
No abstract record available.
Inventors
- 👤 Stelzer William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T11/00; B60T11/10; B60T11/16; B60T11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
192 words
IN A HYDRAULIC BRAKE SYSTEM FOR A VEHICLE HAVING FIRST AND SECOND SETS OF BRAKE CYLINDERS, A MASTER CYLINDER OPERABLE TO TRANSMIT A FIRST GIVEN QUANTITY OF FLUID TO SAID FIRST SET OF BRAKE CYLINDERS AND A SECOND GIVEN QUANTITY OF FLUID TO SAID SECOND SET OF BRAKE CYLINDERS TO PRODUCE A HIGHER PRESSURE IN SAID SECOND SET OF BRAKE CYLINDERS, SAID MASTER CYLINDER HAVING A FIRST PISTON OPERABLE TO PRESSURIZE FLUID TO AT LEAST ONE OF SAID SETS OF BRAKE CYLINDERS, A SECOND PISTON MOVABLE INDEPENDENTLY OF SAID FIRST PISTON AND EXPOSED TO THE FLUID PRESSURE OF ONE OF SAID SETS OF BRAKE CYLINDERS ON ONE SIDE THEREOF AND TO THE FLUID PRESSURE OF THE OTHER SAID SET OF BRAKE CYLINDERS ON THE OTHER SIDE THEREOF, AND BYPASS MEANS ASSOCIATED WITH SAID SECOND PISTON PROVIDING FLUID COMMUNICATION BETWEEN SAID FIRST AND SECOND SETS OF SAID BRAKE CYLINDERS, SAID SECOND PISTON BEING MOVABLE IN RESPONSE TO DIFFERENT FLUID PRESSURE FIRST TO CLOSE SAID BYPASS AND THEREAFTER TO PRESSURIZE FLUIDD IN ONE OF SAID SETS OF BRAKE CYLINDERS AND RELIEVE THE PRESSURE OF FLUID IN THE OTHER OF SAID SETS OF BRAKE CYLINDERS.
Claim 2
Dependent Claim
192 words
IN A HYDRAULIC BRAKE SYSTEM FOR A VEHICLE HAVING FIRST AND SECOND SETS OF BRAKE CYLINDERS, A MASTER CYLINDER OPERABLE TO TRANSMIT A FIRST GIVEN QUANTITY OF FLUID TO SAID FIRST SET OF BRAKE CYLINDERS AND A SECOND GIVEN QUANTITY OF FLUID TO SAID SECOND SET OF BRAKE CYLINDERS TO PRODUCE A HIGHER PRESSURE IN SAID SECOND SET OF BRAKE CYLINDERS, SAID MASTER CYLINDER HAVING A FIRST PISTON OPERABLE TO PRESSURIZE FLUID TO AT LEAST ONE OF SAID SETS OF BRAKE CYLINDERS, A SECOND PISTON MOVABLE INDEPENDENTLY OF SAID FIRST PISTON AND EXPOSED TO THE FLUID PRESSURE OF ONE OF SAID SETS OF BRAKE CYLINDERS ON ONE SIDE THEREOF AND TO THE FLUID PRESSURE OF THE OTHER SAID SET OF BRAKE CYLINDERS ON THE OTHER SIDE THEREOF, AND BYPASS MEANS ASSOCIATED WITH SAID SECOND PISTON PROVIDING FLUID COMMUNICATION BETWEEN SAID FIRST AND SECOND SETS OF SAID BRAKE CYLINDERS, SAID SECOND PISTON BEING MOVABLE IN RESPONSE TO DIFFERENT FLUID PRESSURE FIRST TO CLOSE SAID BYPASS AND THEREAFTER TO PRESSURIZE FLUIDD IN ONE OF SAID SETS OF BRAKE CYLINDERS AND RELIEVE THE PRESSURE OF FLUID IN THE OTHER OF SAID SETS OF BRAKE CYLINDERS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |