US5037457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterile hydrophobic polytetrafluoroethylene membrane laminate
Assignee: EMD Millipore Corp
•
Filing: 1990-03-07
•
Granted: 1991-08-06
•
Expires: 2010-03-07
Abstract
Abstract A gamma radiation sterilized membrane laminate is provided comprising a porous polytetrafluoroethylene membrane directly laminated to a porous polyester web substrate. The laminate is hydrophobic and has a burst strength when unsupported of at least 10 psi in both the forward and reverse direction of filtration after the laminate is exposed to radiation.
Inventors
- 👤 Paul S. Goldsmith
- 👤 Claire M. Carey
- 👤 Donald E. Keeley
- 👤 Vinay Goel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:45
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D71/36; B32; B32B; B32B5/00; B32B5/22; B32B5/32; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A laminate membrane product which comprises a porous polytetrafluoroethylene membrane laminated directly in the absence of an adhesive to a gas permeable polyester web, said laminate being hydrophobic and having a burst strength as measured with an unsupported 13 millimeter diameter disk of said laminate of at least 20 psi in a forward direction and in a reverse direction, after said laminate is exposed to gamma radiation.
Claim 2
Dependent Claim
67 words
A laminate membrane product which comprises a porous polytetrafluoroethylene membrane laminated directly in the absence of an adhesive to a gas permeable polyester web, said laminate being hydrophobic and having a burst strength as measured with an unsupported 13 millimeter diameter disk of said laminate of at least 20 psi in a forward direction and in a reverse direction, after said laminate is exposed to gamma radiation.
Claim 3
Dependent Claim
13 words
The laminate of claim 1 wherein said polyester web is a woven web.
Claim 4
Dependent Claim
13 words
The laminate of claim 1 wherein said polyester web is a nonwoven web.
Claim 5
Dependent Claim
98 words
The process of producing the product of claim 1 which comprises winding (a) a polytetrafluoroethylene membrane and (b) a gas permeable polyester web in direct contact with each other and (c) a protective sheet between each layer consisting of said membrane and said web, heating said membrane, said web and said protective sheet subsequent to said winding for a sufficient time to effect lamination of said membrane to said web while preventing adjacent layers from laminating to each other and exposing said laminated web and membrane to gamma radiation to effect sterilization of said laminated web and membrane.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said polyester web is a woven web.
Claim 7
Dependent Claim
13 words
The process of claim 4 wherein said polyester web is a nonwoven web.
References Cited (Backward Citations)
US2732092A
Cited
US3332216A
Cited
US3523408A
Cited
US3575170A
Cited
US3668837A
Cited
US3769137A
Cited
US3778971A
Cited
US3735562A
Cited
US3797202A
Cited
US3767500A
Cited
US3909302A
Cited
US3854907A
Cited
US3969174A
Cited
US4109543A
Cited
US4190426A
Cited
US4278084A
Cited
US4735854A
Cited
US4525182A
Cited
GB2157188A
Cited
US4758297A
Cited
US4790857A
Cited
US4929303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |