US3679540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced microporous film
Assignee: Celanese Corp
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Filing: 1970-11-27
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Granted: 1972-07-25
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Expires: 1990-11-27
Abstract
Abstract MICROPOROUS FILMS EXHIBIT MANY PROPERTIES WHICH ARE BENEFICIAL IN SPECIALIZED END USES, HOWEVER, BECAUSE OF THE MICROPOROUS CHARACTERISTICS, THE FILM INHERENTLY SUFFERS FROM POOR STRENGHT. BY REINFORCING THE MICROPOROUS FILMS WITH A MACROPOROUS SUBSTRATE THE STRENGTH PROBLEMS HAVE BEEN OVERCOME WHILE MAINTAINING THE DESIRABLE PERMEABILITY AND ACCORDINGLY, THE REINFORCED FILMS MAY NOW BE USED IN STERILE PACKAGING AND AS HOSPITAL BED SHEETS, PILLOW LINERS AND THE LIKE.
Inventors
- 👤 Daniel Zimmerman
- 👤 Stanley Wolfowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:55
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/12; B32B27/32; B32B3/00; B32B3/26; B32B3/266; B32B3/28; B32B5/00; B32B5/02; B32B5/022; B32B7/00; B32B7/04; B32B7/12; B32B38/00; B32B38/04; B32B2038/047; B32B2305/00; B32B2305/02; B32B2305/026; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/726; B32B2307/7265; B32B2323/00; B32B2323/10; B32B2437/00; B32B2439/00; B32B2439/80; B32B2601/00; Y; Y10; Y10S; Y10S521/00; Y10S521/918; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249981; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/3341; Y10T442/3854; Y10T442/387; Y10T442/3886; Y10T442/60; Y10T442/647; Y10T442/649; Y10T442/674; Y10T442/676; Y10T442/678
Claims Analysis
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |