Patent US3245896A successfully refreshed from Google Patents.
US3245896A
Expired / Lapsed
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Method of treating polypropylene film
Assignee: Hercules Powder Co
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Filing: 1962-06-25
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Granted: 1966-04-12
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Expires: 1982-06-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Earl G James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:59
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/10; B29C71/00; B29C71/02; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/10; B29K2023/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
THE METHOD OF TREATING A SURFACE OF STEREOREGULAR POLYPROPYLENE FILM TO RENDER IT ADHERENT TO HEAT-SEALABLE COATINGS TO THE DEGREE THAT THE ADHESION OF SAID COATING TO THE FILM SURFACE IS AT LEAST EQUAL TO THE COHESIVE FORCE OF SAID COATING TO ITSELF WHEN HEAT-SEALED WHICH COMPRISES SUBJECTING SAID SURFACE TO A PULSATING ELECTROSTATIC DISCHARGE WHILE THE FILM IS AT A TEMPERATURE OF AT LEAST ABOUT 160*F., THE TREATED SURFACE THEREBY HAVING A MCLAUGHLIN ANGLE OF AT LEAST 60*.
Claim 2
Independent Claim
79 words
THE METHOD OF TREATING A SURFACE OF STEREOREGULAR POLYPROPYLENE FILM TO RENDER IT ADHERENT TO HEAT-SEALABLE COATINGS TO THE DEGREE THAT THE ADHESION OF SAID COATING TO THE FILM SURFACE IS AT LEAST EQUAL TO THE COHESIVE FORCE OF SAID COATING TO ITSELF WHEN HEAT-SEALED WHICH COMPRISES SUBJECTING SAID SURFACE TO A PULSATING ELECTROSTATIC DISCHARGE WHILE THE FILM IS AT A TEMPERATURE OF AT LEAST ABOUT 160*F., THE TREATED SURFACE THEREBY HAVING A MCLAUGHLIN ANGLE OF AT LEAST 60*.
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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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |