US4385093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-component, highly porous, high strength PTFE article and method for manufacturing same
Assignee: W.L. Gore and Associates Inc
•
Filing: 1980-11-06
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Granted: 1983-05-24
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Expires: 2000-11-06
Abstract
Abstract A method for producing a multi-component, porous PTFE article. Components of PTFE containing a liquid lubricant are placed in intimate contact, dried and then stretched in one or more directions. The PTFE components may optionally contain a filler. The resultant product has a virtually uninterrupted structure at the join and possesses very high bond strengths.
Inventors
- 👤 Daniel E. Hubis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:14
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/16; B; B32; B32B; B32B27/00; B32B27/32; B32B27/322; A61L27/50; A61L27/56; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B32B38/00; B32B38/0012; B32B5/00; B32B5/18; C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; C08J9/00; C08J9/28; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B32B2038/0028; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/52; B32B2327/00; B32B2327/12; B32B2327/18; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S277/945; Y10S277/946; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249986; Y10T428/25; Y10T428/251; Y10T428/252; Y10T428/26; Y10T428/269; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/30; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
57 words
A multi-layer article comprising at least two layers of porous polytetrafluoroethylene superimposed on top of one another such that said multi-layer article is thicker than any one layer there being substantially no change in porosity between said layers and the bond strength in the Z direction being equal to the Z direction strength of the individual layers.
Claim 2
Dependent Claim
57 words
A multi-layer article comprising at least two layers of porous polytetrafluoroethylene superimposed on top of one another such that said multi-layer article is thicker than any one layer there being substantially no change in porosity between said layers and the bond strength in the Z direction being equal to the Z direction strength of the individual layers.
Claim 3
Dependent Claim
28 words
The article of claim 1 in which the bond strength in the Z direction is equal to the Z direction strength of at least one of said layers.
Claim 4
Dependent Claim
23 words
The article of claim 1 in which the microstructure of said article consists of nodes interconnected by fibrils said microstructure transcending said layers.
Claim 5
Dependent Claim
11 words
The article of claim 1 having a thickness exceeding 0.0005 inch.
Claim 6
Dependent Claim
11 words
The article of claim 1 having a thickness exceeding 0.040 inch.
Claim 7
Dependent Claim
11 words
The article of claim 1 having a thickness exceeding 0.075 inch.
Claim 8
Dependent Claim
8 words
The article of claim 1 containing a filler.
Claim 9
Dependent Claim
24 words
The article of claim 1 containing a filler wherein said filler is contained in an amount between about 4.5% and about 50% by weight.
Claim 10
Dependent Claim
15 words
The article of claim 1 containing a filler wherein said filler is TiO 2 .
Claim 11
Dependent Claim
18 words
The article of claim 9 in which said TiO 2 has a mean diameter of about 20 nonometers.
Claim 12
Dependent Claim
11 words
The article of claim 8 wherein said filler is carbon black.
Claim 13
Dependent Claim
11 words
The article of claim 8 wherein said filler is activated charcoal.
Claim 14
Dependent Claim
11 words
The article of claim 8 wherein said filler is zirconium dioxide.
Claim 15
Dependent Claim
10 words
The article of claim 8 wherein said filler is asbestos.
Claim 16
Dependent Claim
11 words
The article of claim 8 wherein said filler is a pigment.
Claim 17
Dependent Claim
11 words
The article of claim 8 wherein said filler is a mica.
Claim 18
Dependent Claim
10 words
The article of claim 8 wherein said filler is glass.
Claim 19
Dependent Claim
11 words
The article of claim 8 wherein said filler is potassium titinate.
Claim 20
Dependent Claim
10 words
The article of claim 8 wherein said filler is polysiloxane.
Claim 21
Dependent Claim
17 words
The article of claim 1 which has not been heated above the crystalline melt point of polytetrafluoroethylene.
Claim 22
Dependent Claim
25 words
The article of claim 1 which has been heated above the crystalline melt point of polytetrafluoroethylene for a time sufficient to partially sinter said article.
Claim 23
Dependent Claim
25 words
The article of claim 1 which has been heated above the crystalline melt point of polytetrafluoroethylene for a time sufficient to fully sinter said article.
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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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |