US3389016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealable sheet having a thermoplastic surface layer of a mixture of a polyolefin and certain copolymers of polyolefins
Assignee: Permacel
•
Filing: 1964-03-12
•
Granted: 1968-06-18
•
Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Holtz Albert
- 👤 Robert H Lamason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:05
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T442/00; Y10T442/20; Y10T442/2738; Y10T442/2746
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A HEAT SEALABLE SHEET MATERIAL COMPRISING A THIN, FLEXIBLE BACKING AND A THIN, NORMALLY NON-TACKY THERMOPLASTIC COATING BONDED THERETO BY MECHANICAL AND POLAR, MOLECULAR FORCE; SAID THERMOPLASTIC COATING CONSISTING ESSENTIALLY OF A MIXTURE OF FROM ABOUT 5 TO ABOUT 75% BY WEIGHT OF A POLYOLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND POLYPROPYLENE AND FROM ABOUT 25% TO ABOUT 95% BY WEIGHT OF A COPOLYMER OF AN OLEFIN AND A TERMINALLY UNSATURATED ESTER SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALIPHATIC ESTERS OF ACRYLIC ACID AND THE LOWER ALIPHATIC ESTERS OF VINYL ALCOHOL, SAID POLYOLEFIN HAVING A MELT INDEX OF FROM ABOUT 30 TO ABOUT 250 AND A DENSITY OF FROM ABOUT 0.92 TO ABOUT 0.98 AND SAID COPOLYMER HAVING A MELT INDEX OF FROM ABOUT 2 TO ABOUT 25 AND A DENSITY OF FROM ABOUT 0.92 TO ABOUT 0.96, AND SAID TERMINALLY UNSATURATED ESTER BEING PRESENT IN SAID POPOLYMER IN AN AMOUNT OF FROM ABOUT 5% TO ABOUT 25% BY WEIGHT.
Claim 2
Dependent Claim
164 words
A HEAT SEALABLE SHEET MATERIAL COMPRISING A THIN, FLEXIBLE BACKING AND A THIN, NORMALLY NON-TACKY THERMOPLASTIC COATING BONDED THERETO BY MECHANICAL AND POLAR, MOLECULAR FORCE; SAID THERMOPLASTIC COATING CONSISTING ESSENTIALLY OF A MIXTURE OF FROM ABOUT 5 TO ABOUT 75% BY WEIGHT OF A POLYOLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND POLYPROPYLENE AND FROM ABOUT 25% TO ABOUT 95% BY WEIGHT OF A COPOLYMER OF AN OLEFIN AND A TERMINALLY UNSATURATED ESTER SELECTED FROM THE GROUP CONSISTING OF THE LOWER ALIPHATIC ESTERS OF ACRYLIC ACID AND THE LOWER ALIPHATIC ESTERS OF VINYL ALCOHOL, SAID POLYOLEFIN HAVING A MELT INDEX OF FROM ABOUT 30 TO ABOUT 250 AND A DENSITY OF FROM ABOUT 0.92 TO ABOUT 0.98 AND SAID COPOLYMER HAVING A MELT INDEX OF FROM ABOUT 2 TO ABOUT 25 AND A DENSITY OF FROM ABOUT 0.92 TO ABOUT 0.96, AND SAID TERMINALLY UNSATURATED ESTER BEING PRESENT IN SAID POPOLYMER IN AN AMOUNT OF FROM ABOUT 5% TO ABOUT 25% BY WEIGHT.
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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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |