Patent US4929176A successfully refreshed from Google Patents.
US4929176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noncontrolling type valve
Assignee: Tokai Corp
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Filing: 1989-04-24
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Granted: 1990-05-29
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Expires: 2009-04-24
Abstract
Abstract An improvement of noncontrolling type valve for use in a gas-lighter, a portable cooking stove and other burners, which valve comprises a valve body push-fitted in a recess formed in the top plate of a gas container; and a filter positioned under the valve body to permit a given constant flow of gas to pass to the valve body when the valve opens. The valve is improved according to the present invention in that an annular spacer is fixed to the annular inside edge of the uppersurface of said filter, allowing the bottom end of said valve body to contact the remaining center area of the uppersurface of said filter. The coplanar positioning of the bottom end of the valve body with the annular spacer prevents deformation of the filter even if it is exposed to an increased gas pressure, thereby assuring that the gas flows through the filter at a controlled rate all the time.
Inventors
- 👤 Tomio Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:18
CPC Classifications
F; F23; F23Q; F23Q2/00; F23Q2/16; F23Q2/162; F23Q2/163; Y; Y10; Y10T; Y10T137/00; Y10T137/794; Y10T137/8122
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A noncontrolling type valve for a gas container having a top plate, a recess formed in said top plate and said recess having a through aperture in its bottom to communicate with the inside of said gas container comprising: a valve body push-fitted in said recess; and a filter positioned under said valve body for permitting a given constant flow of gas to pass to said valve body when said valve opens, characterized in that said valve further comprises, in said recess, an annular spacer of a synthetic resin fixed to an annular inside edge of an uppersurface of said filter, said valve body having a bottom end in contact with the remaining area of said uppersurface of said filter, said filter having an undersurface laid across said through aperture in the bottom of said recess, said valve further comprising, in said recess, an O-ring fitted around said bottom end of said valve body and pushed against an uppersurface of said annular spacer and an inner wall of said recess.
Claim 2
Dependent Claim
170 words
A noncontrolling type valve for a gas container having a top plate, a recess formed in said top plate and said recess having a through aperture in its bottom to communicate with the inside of said gas container comprising: a valve body push-fitted in said recess; and a filter positioned under said valve body for permitting a given constant flow of gas to pass to said valve body when said valve opens, characterized in that said valve further comprises, in said recess, an annular spacer of a synthetic resin fixed to an annular inside edge of an uppersurface of said filter, said valve body having a bottom end in contact with the remaining area of said uppersurface of said filter, said filter having an undersurface laid across said through aperture in the bottom of said recess, said valve further comprising, in said recess, an O-ring fitted around said bottom end of said valve body and pushed against an uppersurface of said annular spacer and an inner wall of said recess.
Claim 3
Dependent Claim
28 words
A noncontrolling type valve according to claim 1 wherein said filter is fixed to an underside of said annular spacer by thermocompression bonding, ultrasonic welding or impulse welding.
Claim 4
Dependent Claim
19 words
A noncontrolling type valve according to claim 1 or 2 wherein said filter has unwoven cloth on its uppersurface.
Claim 5
Dependent Claim
32 words
A noncontrolling type valve according to claim 1 or 2 wherein said bottom end of said valve body projects downward below said undersurface of said annular spacer to stretch said filter tight.
Claim 6
Dependent Claim
29 words
A noncontrolling type valve according to claims 1 or 2 wherein said through aperture has a decreased diameter small enough to cause no gas trap due to surface tension.
Claim 7
Dependent Claim
27 words
A noncontrolling type valve according to claim 4 wherein said through aperture has a decreased diameter small enough to cause no gas trap due to surface tension.
Claim 8
Dependent Claim
30 words
A noncontrolling type valve according to claim 3 wherein said bottom end of said valve body projects downward below said undersurface of said annular spacer to stretch said filter tight.
Claim 9
Dependent Claim
27 words
A noncontrolling type valve according to claim 3 wherein said through aperture has a decreased diameter small enough to cause no gas trap due to surface tension.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |