US4708167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Air Paq Inc
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Filing: 1986-12-01
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Granted: 1987-11-24
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Expires: 2006-12-01
Abstract
Abstract A check valve comprising a fluid pipe of a plastic film formed in a flat shape, and at least one valve body of a rectangular plastic film disposed in said fluid pipe, said valve body being bonded at the longitudinal edges thereof to the longitudinal edges of said fluid pipe, the tip end of said valve body in the fluid flowing direction being bonded to the inner side of one of the upper and lower flat surfaces of said fluid pipe to form a closed portion and an open portion, the base end of said valve body being not bonded to said fluid pipe to form openings between said valve body and the flat upper and lower surfaces of said fluid pipe, whereby a fluid can flow in a gap between one of said openings at the base end of said valve body and said open portion at the tip end thereof.
Inventors
- 👤 Toshimichi Koyanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:10
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; F16K15/1402; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T137/7843; Y10T137/7879; Y10T137/788; Y10T137/7882
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A check valve comprising a fluid pipe of a plastic film formed in a flat shape, and at least one valve body of a rectangular plastic film disposed in said fluid pipe, said valve body being bonded at the longitudinal edges thereof to the longitudinal edges of said fluid pipe, the tip end of said valve body in the fluid flowing direction being bonded to the inner side of one of the upper and lower flat surfaces of said fluid pipe to form a closed portion and an open portion, the base end of said valve body being not bonded to said fluid pipe to form openings between said valve body and the flat upper and lower surfaces of said fluid pipe, whereby a fluid can flow in a gap between one of said openings at the base end of said valve body and said open portion at the tip end thereof.
Claim 2
Dependent Claim
152 words
A check valve comprising a fluid pipe of a plastic film formed in a flat shape, and at least one valve body of a rectangular plastic film disposed in said fluid pipe, said valve body being bonded at the longitudinal edges thereof to the longitudinal edges of said fluid pipe, the tip end of said valve body in the fluid flowing direction being bonded to the inner side of one of the upper and lower flat surfaces of said fluid pipe to form a closed portion and an open portion, the base end of said valve body being not bonded to said fluid pipe to form openings between said valve body and the flat upper and lower surfaces of said fluid pipe, whereby a fluid can flow in a gap between one of said openings at the base end of said valve body and said open portion at the tip end thereof.
Claim 3
Dependent Claim
19 words
A check valve as set forth in claim 1, wherein one valve body is disposed in the fluid pipe.
Claim 4
Dependent Claim
28 words
A check valve as set forth in claim 1, wherein a plurality of valve bodies are disposed in series at a predetermined space interval in the fluid pipe.
Claim 5
Dependent Claim
41 words
A check valve as set forth in claim 3, wherein a plurality of valve bodies are disposed in the fluid pipe with all tip ends of said valve bodies bonded to the same upper or lower surface of said fluid pipe.
Claim 6
Dependent Claim
44 words
A check valve as set forth in claim 3, wherein a plurality of valve bodies are disposed in the fluid pipe with each of the tip ends of said valve bodies bonded to either upper or lower surface of said fluid pipe as desired.
Claim 7
Dependent Claim
40 words
A check valve as set forth in claim 1, wherein a gap between one of the openings at the base end of the valve body and the open portion at the tip end of the valve body is open throughout.
Claim 8
Dependent Claim
43 words
A check valve as set forth in claim 1, wherein a gap between one of the openings at the base end of the valve body and the open portion at the tip end of the valve body is partially closed by bonding means.
Claim 9
Dependent Claim
44 words
A check valve as set forth in claim 7, wherein the gap between one of the openings at the base end of the valve body and the open portion at the tip end of the valve body is partially closed by one bonding means.
Claim 10
Dependent Claim
46 words
A check valve as set forth in claim 7, wherein the gap between one of the openings at the base end of the valve body and the open portion at the tip end of the valve body is partially closed by a plurality of bonding means.
Claim 11
Dependent Claim
35 words
A check valve as set forth in claim 1, wherein the fluid pipe has, at the fluid inlet/outlet port thereof, a projecting guide tongue with the use of which a fluid charge/discharge means is inserted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |