US3746565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide articles of reduced vapor permeability
Assignee: Dynamit Nobel AG
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Filing: 1970-11-02
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Granted: 1973-07-17
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Expires: 1990-11-02
Abstract
Abstract SHAPED ARTICLES OF AMORPHOUS POLYAMIDES HAVE THEIR GAS AND WATER VAPOR PERMEABILITY REDUCED BY IMMERSION IN A 45-80:55-20 WATER-COPOLYMER DISPERSION, THE COPOLYMER COMPRISING 85-90:15-10 VINYLIDENE CHLORIDE: ETHYL ACRYLATE, ALL BY WEIGHT, FOLLOWED BY DRYING IN WARM AIR. THE AMORPHOUS POLYAMIDE PREFERABLY COMPRISES RADICALS OF TEREPHTHALIC ACID, ISOPHTHALIC ACID OR MIXTURES THEREOF AND RADICALS OF 2,2,4-TRIMETHYLHEXAMETHYLENEDIAMINE, 2,4,4-TRIMETHYLHEXAMETHYLENEDIAMINE, HEXAMETHYLENEDIAMINE, NONAMETHYLENEDIAMINE OR MIXTURES THEREOF; THE SHAPED ARTICLE MAY ALSO COMPRISE UP TO ABOUT 40% BY WEIGHT OF A PARTIALLY CRYSTALLIZABLE POLYAMIDE.
Inventors
- 👤 J Schneider
- 👤 W Pungs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:24
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/048; C08J2377/00; C08J2427/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |