US4116452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeve seal for master cylinders of hydraulic brake systems
Assignee: ITT Inc
•
Filing: 1977-11-07
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Granted: 1978-09-26
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Expires: 1997-11-07
Abstract
Abstract A sleeve seal for sealing a front end of a piston and a cylinder wall wherein the front surface of the sleeve seal remote from the front end of the piston is provided with circular coaxial undulations.
Inventors
- 👤 Johannes Schanz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A sleeve seal for master cylinders of hydraulic brake systems comprising: cylindrical cylinder wall having a longitudinal axis; a piston disposed in said cylinder wall coaxial of said axis, said piston having a front end and a given diameter; a cylindrical piston extension disposed coaxial of said axia and connected to said front end of said piston, said piston extension having a diameter less than said given diameter; and said sleeve seal including a flat surface transverse of said axis resting against said front end of said piston adjacent the outer surface of said piston extension and the inner surface of said cylinder wall, said flat surface providing a space adjacent the inner surface of said cylinder wall and a space adjacent the outer surface of said piston extension, an outer elongated, circular sealing lip extending from said flat surface resting against the inner surface of said cylinder wall, an inner elongated, circular sealing lip extending from said flat surface resting against the outer surface of said piston extension, and circular coaxial undulations disposed in the front surface of said sleeve seal spaced from said flat surface between said outer and inner sealing lips.
Claim 2
Dependent Claim
194 words
A sleeve seal for master cylinders of hydraulic brake systems comprising: cylindrical cylinder wall having a longitudinal axis; a piston disposed in said cylinder wall coaxial of said axis, said piston having a front end and a given diameter; a cylindrical piston extension disposed coaxial of said axia and connected to said front end of said piston, said piston extension having a diameter less than said given diameter; and said sleeve seal including a flat surface transverse of said axis resting against said front end of said piston adjacent the outer surface of said piston extension and the inner surface of said cylinder wall, said flat surface providing a space adjacent the inner surface of said cylinder wall and a space adjacent the outer surface of said piston extension, an outer elongated, circular sealing lip extending from said flat surface resting against the inner surface of said cylinder wall, an inner elongated, circular sealing lip extending from said flat surface resting against the outer surface of said piston extension, and circular coaxial undulations disposed in the front surface of said sleeve seal spaced from said flat surface between said outer and inner sealing lips.
References Cited (Backward Citations)
FR550298A
Cited
DE875744C
Cited
US2781208A
Cited
US2731315A
Cited
US3505930A
Cited
US3498623A
Cited
US3550990A
Cited
US3915463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |