US3965930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve assembly
Assignee: Mettoy Co Ltd
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Filing: 1975-02-25
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Granted: 1976-06-29
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Expires: 1995-02-25
Abstract
Abstract A member of a non-return valve having an axial blind bore defining an inlet, a cylindrical sealing surface recessed between axially spaced radial shoulders, and one or more radial passageways in the region of the sealing surface communicating with the bore and sealed against return fluid flow by an elastomeric sleeve carried by the sealing surface, is constructed in two parts of synthetic plastics material which snap fit together, with the shoulders being formed one on each part.
Inventors
- 👤 Bryan Frederick Nicholls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:34
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/20; F16K15/14; F16K15/1402; F16K15/144; F16K15/145; F16K17/00; F16K17/02; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7843; Y10T137/7859; Y10T137/7861; Y10T137/7879; Y10T137/7888; Y10T137/7889
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
In a non-return valve comprising a generally cylindrical valve member having opposed axial ends, an axial bore terminating at an inlet in one said end of the member, a pair of axially spaced walls projecting radially from said member and a circumferential sealing surface between said walls for carrying a close fitting sleeve of elastomeric material, and at least one radial passageway extending through said sealing surface and communicating with said bore, the improvement according to which said member is a synthetic plastics molding comprising two parts having snap-fitting interengagement; a first one of said parts defining said axial bore, one of said walls and said circumferential sealing surface and comprising an end portion located beyond the sealing surface having a radially enlarged head and the other one of said parts including the other of said walls, and being annular and resiliently deformable to permit its location over and engagement behind said radially enlarged head of said first part.
Claim 2
Dependent Claim
159 words
In a non-return valve comprising a generally cylindrical valve member having opposed axial ends, an axial bore terminating at an inlet in one said end of the member, a pair of axially spaced walls projecting radially from said member and a circumferential sealing surface between said walls for carrying a close fitting sleeve of elastomeric material, and at least one radial passageway extending through said sealing surface and communicating with said bore, the improvement according to which said member is a synthetic plastics molding comprising two parts having snap-fitting interengagement; a first one of said parts defining said axial bore, one of said walls and said circumferential sealing surface and comprising an end portion located beyond the sealing surface having a radially enlarged head and the other one of said parts including the other of said walls, and being annular and resiliently deformable to permit its location over and engagement behind said radially enlarged head of said first part.
Claim 3
Dependent Claim
25 words
A valve member as claimed in claim 1 wherein said enlarged head is at the axial end of the first part remote from said inlet.
References Cited (Backward Citations)
US2715980A
Cited
US2855206A
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US2890838A
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US3410299A
Cited
US3601151A
Cited
US3853338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |