US5399640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of liquid tetrafluoroethylene in aqueous dispersion
Assignee: W.L. Gore and Associates Inc
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Filing: 1994-05-18
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Granted: 1995-03-21
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Expires: 2014-05-18
Abstract
Abstract Novel polytetrafluoroethylene structures are described, which were prepared by polymerizing liquid tetrafluoroethylene in aqueous dispersion. The novel structures include continuous three-dimensional networks of fibrils and bundles of fibrils.
Inventors
- 👤 David E. Hazlebeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:20
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
A polytetrafluoroethylene material characterized in that it is a spongy mass comprised visually of layers of sheet-like configuration and has a microstructure of a three-dimensional continuous network of convoluted randomly disposed submicron diameter fibrils and bundles of submicron diameter fibrils.
Claim 2
Dependent Claim
40 words
A polytetrafluoroethylene material characterized in that it is a spongy mass comprised visually of layers of sheet-like configuration and has a microstructure of a three-dimensional continuous network of convoluted randomly disposed submicron diameter fibrils and bundles of submicron diameter fibrils.
Claim 3
Dependent Claim
41 words
A polytetrafluoroethylene material characterized in that it is a spongy mass comprised of a microstructure of predominantly randomly disposed platelets interconnecting or interpenetrating one another and also being randomly connected by randomly disposed submicron fibrils to form a three-dimensional continuous network.
Claim 4
Dependent Claim
41 words
A polytetrafluoroethylene material characterized in that it is a spongy mass comprised of a microstructure of predominantly randomly disposed platelets interconnecting or interpenetrating one another and also being randomly connected by randomly disposed submicron fibrils to form a three-dimensional continuous network.
Claim 5
Dependent Claim
13 words
The material of claim 1 or 2 in the form of a gel.
Claim 6
Dependent Claim
13 words
The material of claim 1 or 2 where the polytetrafluoroethylene is a homopolymer.
Claim 7
Dependent Claim
13 words
The material of claim 1 or 2 where the polytetrafluoroethylene contains comonomer units.
Claim 8
Dependent Claim
24 words
The material of claim 5 wherein the comonomer units are selected from the class consisting of halogenated olefins, hydrogenated unsaturated monomers, and crosslinking monomers.
References Cited (Backward Citations)
CA592035A
Cited
GB574688A
Cited
US3607878A
Cited
GB1397931A
Cited
US4384092A
Cited
EP0248446A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |