US4930535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding leaf valve and method of making
Assignee: APPALOOSA MANAGEMENT LP
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Filing: 1989-06-23
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Granted: 1990-06-05
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Expires: 2009-06-23
Abstract
Abstract A leaf valve folds upon itself to provide positive sealing of a pressurized chamber under a variety of pressure conditions. In particular, the valve stem folds to effectively close the lumen and provide a positive seal even at low differential pressure. A method of making the valve is descirbed.
Inventors
- 👤 Elizabeth A. Rinehold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
A; A61; A61F; A61F5/00; A61F5/0003; A61F5/0013; A61F5/0036; A61B; A61B90/00; A61B90/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0491; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7891
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A method of making a folding leaf valve comprising the steps of: (a) placing a strip of lumen-forming releasing material A between two wider strips of raw elastomer to form a first laminate. (b) layering onto both outer surfaces of said first laminate a releasing material B to form a second laminate, (c) folding said second laminate over itself at least once; and (d) heating said folded second laminate for a period of time sufficient to vulcanize all elastomer surfaces in contact with each other.
Claim 2
Independent Claim
85 words
A method of making a folding leaf valve comprising the steps of: (a) placing a strip of lumen-forming releasing material A between two wider strips of raw elastomer to form a first laminate. (b) layering onto both outer surfaces of said first laminate a releasing material B to form a second laminate, (c) folding said second laminate over itself at least once; and (d) heating said folded second laminate for a period of time sufficient to vulcanize all elastomer surfaces in contact with each other.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the dimensions of said lumen-forming releasing material are chosen to accommodate the passage of a catheter through the lumen formed thereby.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the thickness of said first releasing material and said second releasing material is the same.
Claim 5
Dependent Claim
100 words
A valve which is self-sealing to the track of a filltube removed therefrom, said valve thereafter providing positive closure of a conduit passing therethrough by folding discretely upon itself through an angle greater than 90 degrees comprising: (a) a discretely folded elastic valve stem made from an elastomeric polymer; and (b) a conduit passing through said elastic valve stem ; wherein the valve stem contains a plurality of folds, said folds being sequentially reversed 180 degrees to form a zigzag valve stem and wherein the axis of folding of the valve stem is perpendicular to the direction of the conduit.
Claim 6
Dependent Claim
100 words
A valve which is self-sealing to the track of a filltube removed therefrom, said valve thereafter providing positive closure of a conduit passing therethrough by folding discretely upon itself through an angle greater than 90 degrees comprising: (a) a discretely folded elastic valve stem made from an elastomeric polymer; and (b) a conduit passing through said elastic valve stem ; wherein the valve stem contains a plurality of folds, said folds being sequentially reversed 180 degrees to form a zigzag valve stem and wherein the axis of folding of the valve stem is perpendicular to the direction of the conduit.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |