Patent US3989285A successfully refreshed from Google Patents.
US3989285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compatible vacuum seal
Assignee: United States Department of the Army
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Filing: 1974-12-23
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Granted: 1976-11-02
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Expires: 1994-12-23
Abstract
Abstract A compound sealing gasket is provided for vacuum line connectors which ines a tight seal and reduced galvanic reactions when the connectors consist of dissimilar metals.
Inventors
- 👤 Gary K. Yancey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:20
CPC Classifications
F; F16; F16L; F16L23/00; F16L23/16; F16L23/18; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/08; F16J15/0881; Y; Y10; Y10S; Y10S277/00; Y10S277/913; Y10S285/00; Y10S285/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
In a high vacuum system an improved coupling between two adjacent elements comprising: a pair of identical fittings each permanently attached to one of said elements and having coupling flanges surrounding a central aperture opening into said element the opposing surfaces of said flanges each defining a continuous outer contact surface and an inner continuous stepped recess surrounding said central aperture; a pair of continuous knife members with spaced opposed cutting edges each of ramp shaped cross-section with a height less than the depth of said recesses mounted in said recesses; a continuous gasket located in said recesses between said knife members having a hard central core member with a thickness less than the spacing between said knife members when said outer contact surfaces are in abutment and a softer outer layer with a thickness greater than the spacing between said core member and each adjacent knife member; and means to draw said flanges together until said contact surfaces meet whereby said knife members penetrate said outer layer but do not engage said central core member.
Claim 2
Dependent Claim
176 words
In a high vacuum system an improved coupling between two adjacent elements comprising: a pair of identical fittings each permanently attached to one of said elements and having coupling flanges surrounding a central aperture opening into said element the opposing surfaces of said flanges each defining a continuous outer contact surface and an inner continuous stepped recess surrounding said central aperture; a pair of continuous knife members with spaced opposed cutting edges each of ramp shaped cross-section with a height less than the depth of said recesses mounted in said recesses; a continuous gasket located in said recesses between said knife members having a hard central core member with a thickness less than the spacing between said knife members when said outer contact surfaces are in abutment and a softer outer layer with a thickness greater than the spacing between said core member and each adjacent knife member; and means to draw said flanges together until said contact surfaces meet whereby said knife members penetrate said outer layer but do not engage said central core member.
Claim 3
Dependent Claim
23 words
The system according to claim 1 wherein: the ratio of hardness of said outer layer to said knife member is less than 0.4.
Claim 4
Dependent Claim
18 words
The system according to claim 1 wherein: said outer layer is mechanically stable between 77° and 373° K.
Claim 5
Dependent Claim
26 words
The system according to claim 1 wherein: the vapor pressure of said outer layer is less than two orders of magnitude greater than said knife member.
Claim 6
Dependent Claim
30 words
The system according to claim 1 wherein: said knife is defined by a pair of coaxial intersecting cylindrical and conical surfaces having a minimal angle therebetween of approximately 80° .
Claim 7
Dependent Claim
27 words
The system according to claim 1 wherein: the thickness of said layer is approximately twice the spacing between said core member and one of said knife members.
References Cited (Backward Citations)
CH6961A
Cited
US1896795A
Cited
GB712786A
Cited
US2761707A
Cited
US3208758A
Cited
US3301578A
Cited
US3747963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |