US3782686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Taps
Assignee: COWIE SCIENT Ltd
•
Filing: 1972-06-19
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Granted: 1974-01-01
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Expires: 1992-06-19
Abstract
Abstract This invention relates to a plug and socket type stopcock, notably for use in high vacuum apparatus, in which erosion of the fluorinated hydrocarbon polymer plug is reduced by indenting the plug face around the orifices of the bore through the plug.
Inventors
- 👤 G Cowie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:01
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/08; F16K5/14; F16K5/16; F16K5/162; F16K5/165; F16K5/02; F16K5/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
42 words
A fluorinated hydrocarbon polymer stopcock plug of generally frusto-conical shape having a transverse bore therethrough, characterised in that the surface of the plug is indented at an orifice of the bore to provide a flatted surface around that orifice of the bore.
Claim 2
Dependent Claim
42 words
A fluorinated hydrocarbon polymer stopcock plug of generally frusto-conical shape having a transverse bore therethrough, characterised in that the surface of the plug is indented at an orifice of the bore to provide a flatted surface around that orifice of the bore.
Claim 3
Dependent Claim
44 words
A plug as claimed in claim 1 characterised in that the indented flatted surface is a generally flat surface passing through a chord of the cross section of the plug and lying in a plane substantially parallel to the longitudinal face of the plug.
Claim 4
Dependent Claim
22 words
A plug as claimed in claim 1 characterised in that the upper and lower extremities of the plug are of reduced diameter.
Claim 5
Dependent Claim
86 words
A tapered plug and socket twist valve wherein the plug is made from a fluorinated hydrocarbon polymer and has a generally frusto-conical shape, there being a transverse bore through said plug adapted to be placed in register with apertures in the socket wall, characterised in that the surface of the plug is indented at an orifice of the bore to provide a flatted surface around that orifice of the bore, which surface is of greater dimensions than the diameter of the apertures in the socket wall.
Claim 6
Dependent Claim
86 words
A tapered plug and socket twist valve wherein the plug is made from a fluorinated hydrocarbon polymer and has a generally frusto-conical shape, there being a transverse bore through said plug adapted to be placed in register with apertures in the socket wall, characterised in that the surface of the plug is indented at an orifice of the bore to provide a flatted surface around that orifice of the bore, which surface is of greater dimensions than the diameter of the apertures in the socket wall.
Claim 7
Dependent Claim
56 words
A valve as claimed in claim 4 characterised in that the indented surface on the plug extends around the mouth of the aperture in the socket wall from one half to two times the radius of the aperture in the socket wall when the plug bore and the aperture in the socket wall are in register.
Claim 8
Dependent Claim
29 words
A valve as claimed in claim 4 wherein each orifice of the transverse bore is adapted to communicate with only one aperture in the socket wall at a time.
Claim 9
Dependent Claim
44 words
A valve as claimed in claim 4 characterised in that each unflatted sealing surface between the indented surfaces on the plug measures in all directions at least 1 1/2 times the diameter of the aperture in the socket wall which it is to seal.
Claim 10
Dependent Claim
52 words
A valve as claimed in claim 5 characterised in that each unflatted sealing surface between the indented surfaces on the plug measures tangentially at the level of the aperture in the socket wall not more than 3 times the diameter of the aperture in the socket wall which it is to seal.
Claim 11
Dependent Claim
150 words
A tapered plug and socket twist valve wherein the plug is made from a fluorinated hydrocarbon polymer and has a generally frusto-conical shape, there being a transverse bore through said plug adapted to be placed in register with apertures in the socket wall, characterised in that the surface of the plug is indented at an orifice of the bore to provide a flatted surface around that orifice of the bore, which surface exteNds around the mouth of the aperture in the socket wall from one half to two times the radius of the aperture in the socket wall when the plug bore and the aperture in the socket wall are in register; and in that each unflatted sealing surface between the indented surface on the plug measures in all directions from 1 1/2 to 3 times the diameter of the aperture in the socket wall which it is to seal.
Claim 12
Dependent Claim
150 words
A tapered plug and socket twist valve wherein the plug is made from a fluorinated hydrocarbon polymer and has a generally frusto-conical shape, there being a transverse bore through said plug adapted to be placed in register with apertures in the socket wall, characterised in that the surface of the plug is indented at an orifice of the bore to provide a flatted surface around that orifice of the bore, which surface exteNds around the mouth of the aperture in the socket wall from one half to two times the radius of the aperture in the socket wall when the plug bore and the aperture in the socket wall are in register; and in that each unflatted sealing surface between the indented surface on the plug measures in all directions from 1 1/2 to 3 times the diameter of the aperture in the socket wall which it is to seal.
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |