US5308664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapidly recoverable PTFE and process therefore
Assignee: W.L. Gore and Associates Inc
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Filing: 1988-09-23
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Granted: 1994-05-03
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Expires: 2008-09-23
Abstract
Abstract This invention relates to porous polytetrafluoroethylene (hereinafter PTFE) materials having the property of rapid recovery and a method for producing these materials. The microstructure of the porous PTFE material consists of nodes interconnected by fibrils, substantially all of the fibrils having a bent or wavy appearance. Articles made from these materials are particularly suitable for use in the medical field, but are also useful in other areas such as filtration and fabric applications.
Inventors
- 👤 Wayne D. House
- 👤 David J. Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/005; B29C67/00; B29C67/20; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/04; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10S; Y10S264/00; Y10S264/73; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/24; Y10T428/24628; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A porous shaped article consisting essentially of polytetrafluoroethylene, said article having a microstructure of nodes interconnected by fibrils, substantially all of said fibrils having a bent appearance and a V/H ratio of at least 0.15, said article at ambient temperature is capable of being stretched and then rapidly recovering more than 6.0% of its stretched length.
Claim 2
Dependent Claim
56 words
A porous shaped article consisting essentially of polytetrafluoroethylene, said article having a microstructure of nodes interconnected by fibrils, substantially all of said fibrils having a bent appearance and a V/H ratio of at least 0.15, said article at ambient temperature is capable of being stretched and then rapidly recovering more than 6.0% of its stretched length.
Claim 3
Dependent Claim
56 words
A porous shaped article consisting essentially of polytetrafluoroethylene, said article having a microstructure of nodes interconnected by fibrils, substantially all of said fibrils having a bent appearance and a V/H ratio of at least 0.20, said article at ambient temperature is capable of being stretched and then rapidly recovering more than 6.0% of its stretched length.
Claim 4
Dependent Claim
56 words
A porous shaped article consisting essentially of polytetrafluoroethylene, said article having a microstructure of nodes interconnected by fibrils, substantially all of said fibrils having a bent appearance and a V/H ratio of at least 0.20, said article at ambient temperature is capable of being stretched and then rapidly recovering more than 6.0% of its stretched length.
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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) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |