Patent US3644259A successfully refreshed from Google Patents.
US3644259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making breathable polyvinyl chloride film
Assignee: Goodrich Corp
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Filing: 1969-10-24
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Granted: 1972-02-22
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Expires: 1989-10-24
Abstract
Abstract Breathable polyvinyl chloride film in thicknesses from about 1 to 5 mils and having moisture vapor transmission rates above 50 are prepared by casting a mixture of a vinyl chloride resin, solvent naphtha, a plasticizer and water and heating to dry and fuse the film.
Inventors
- 👤 Joe Kobylak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:53
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The composition of claim 1 wherein the vinyl chloride is polyvinyl chloride and there is 30 to 60 weight parts of liquid aliphatic hydrocarbon.
Claim 2
Dependent Claim
16 words
The composition of claim 2 wherein there is about 150 to 250 weight parts of water.
Claim 3
Dependent Claim
45 words
The composition of claim 3 wherein the liquid plasticizer is a liquid diester of an aliphatic alcohol containing four to 20 carbon atoms and a dibasic carboxylic acid containing six to 14 carbon atoms present in amounts from about 60 to about 100 weight parts.
Claim 4
Dependent Claim
23 words
The composition of claim 1 containing up to about 45 parts of zinc oxide based on 100 weight parts of vinyl chloride poLymer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |