Patent US3274020A successfully refreshed from Google Patents.
US3274020A
Expired / Lapsed
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Films made from highly hydrolyzed polyvinyl alcohol
Assignee: Cumberland Chemical Corp
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Filing: 1962-02-15
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Granted: 1966-09-20
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Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 Charles A Heiberger
- 👤 Daniel S Dixler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:13
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/048; C08J7/052; C08J2329/00; C08J2329/02; C08J2329/04; C08J2427/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A THIN TRANSPARENT FILM CHARACTERIZED BY AN OXYGEN PERMEABILITY OF AT MOST ABOUT 0.03 CC./100 IN.2/DAY AT 72* F. AND 50% RELATIVE HUMIDITY, COMPRISING A BASE SHEET FORMED FROM POLYVINYL ALCOHOL HAVING A DEGREE OF HYDROYLSIS OF AT LEAST 99.8%, SAID BASE SHEET HAVE A THICKNESS OF ABOUT 0.0001 TO ABOUT 0.01 INCH, AND AN ADHERENT WATER-PROOF POLYMERIC COATING ON AT LEAST ONE SIDE THEREOF.
Claim 2
Dependent Claim
65 words
A THIN TRANSPARENT FILM CHARACTERIZED BY AN OXYGEN PERMEABILITY OF AT MOST ABOUT 0.03 CC./100 IN.2/DAY AT 72* F. AND 50% RELATIVE HUMIDITY, COMPRISING A BASE SHEET FORMED FROM POLYVINYL ALCOHOL HAVING A DEGREE OF HYDROYLSIS OF AT LEAST 99.8%, SAID BASE SHEET HAVE A THICKNESS OF ABOUT 0.0001 TO ABOUT 0.01 INCH, AND AN ADHERENT WATER-PROOF POLYMERIC COATING ON AT LEAST ONE SIDE THEREOF.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |