US3607593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poromeric material having high permeability to gases
Assignee: Montedison SpA
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Filing: 1968-11-05
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Granted: 1971-09-21
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Expires: 1988-11-05
Abstract
Abstract Poromeric material that is impermeable to water but permeable to gases such as air and water vapor. Material comprises a backing fabric, a first foamed layer of a vinyl polymer containing another polymeric material incompatible therewith, this first layer being bonded to the fabric, and a second layer similar to the first layer and bonded thereto, the second layer being foamed less than the first layer.
Inventors
- 👤 Dorino Semenzato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; B; B32; B32B; B32B27/00; C08K; C08K7/00; C08K7/02; C08L; C08L1/00; C08L1/02; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L77/00; D; D06; D06N; D06N3/00; D06N3/0056; D06N3/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2423/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249986; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/3341; Y10T442/60; Y10T442/647; Y10T442/649
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
16 words
The product of claim 1 wherein said polymeric material in each of said layers is polypropylene.
Claim 2
Dependent Claim
27 words
The product of claim 2, wherein the backing fabric is jersey, duck, or nonwoven fabric, and is made of cotton, cellulose, modified cellulose, wool, or synthetic polyamides.
Claim 3
Dependent Claim
29 words
The product of claim 3 wherein the amount of vinyl chloride polymer present in each layer is from about 30 percent to 70 percent by weight of said layer.
Claim 4
Dependent Claim
25 words
The product of claim 4 wherein said polypropylene is in the form of flakes having a particle size of from about 50 to 200 microns.
Claim 5
Dependent Claim
25 words
The product of claim 5 wherein the amount of flakes present is from about 1 percent to 5 percent by weight of the overall layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |