US4050701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid seal
Assignee: Ingersoll Rand Co
•
Filing: 1976-11-26
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Granted: 1977-09-27
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Expires: 1996-11-26
Abstract
Abstract The novel seal comprises a non-contacting, floating ring seal formed, by injection molding, of carbon fiber-reinforced polyphenylene sulfide, for use in fluid-sealing a rotary steel shaft. The reinforced polyphenylene sulfide exhibits thermal expansion which is substantially equal to that of steel; thus a predetermined radial clearance is maintained, between the seal and the shaft without the need for a circumferential steel band, or the like, shrunk onto the seal.
Inventors
- 👤 Paul Dale Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:31
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/26; F16J15/30; C; C09; C09J; C09J181/00; C09J181/02; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/938; Y10S277/944
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A fluid seal, for fluid sealing a steel shaft having a given outside diameter, comprising: a sealing element; said element being formed of a moldable polymer material having a coefficient of expansion substantially equal to the coefficient of expansion of steel; and wherein said element has carbon fibers and polytetrafluoroethylene particles dispersed therewithin.
Claim 2
Dependent Claim
53 words
A fluid seal, for fluid sealing a steel shaft having a given outside diameter, comprising: a sealing element; said element being formed of a moldable polymer material having a coefficient of expansion substantially equal to the coefficient of expansion of steel; and wherein said element has carbon fibers and polytetrafluoroethylene particles dispersed therewithin.
Claim 3
Dependent Claim
15 words
A fluid seal, according to claim 1, wherein: said moldable polymer material comprises polyphenylene sulfide.
Claim 4
Dependent Claim
44 words
A fluid seal, according to claim 1, wherein: said element is of annular configuration, having an inside diameter of from approximately 0.0005 to 0.001 inch (0.0127 to 0.0254 mm) greater than said given diameter; and only said inside diameter of said element is machine-finished.
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |