US4289832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically-impregnated microporous films
Assignee: Biax Fiberfilm Corp
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Filing: 1978-10-26
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Granted: 1981-09-15
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Expires: 1998-10-26
Abstract
Abstract There is disclosed a novel apparatus for the selective stretching of a coated or impregnated substrate of a synthetic thermoplastic polymer or blends thereof to form an impregnated microporous film thereof.
Inventors
- 👤 Eckhard C. A. Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C55/143; B29C55/18; B29K; B29K2105/00; B29K2105/04; Y; Y10; Y10S; Y10S426/00; Y10S426/811; Y10S428/00; Y10S428/905; Y10S428/907; Y10S428/91; Y10T; Y10T428/00; Y10T428/29
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
An opaque low density porous sheet comprised of a chemically-impregnated biaxially stretched film of synthetic material comprised of a blend of a thermoplastic orientable polymer and an incompatible second phase selected from the group consisting of an incompatible polymer of inorganic material or a polymer matrix having an inorganic filler.
Claim 2
Dependent Claim
50 words
An opaque low density porous sheet comprised of a chemically-impregnated biaxially stretched film of synthetic material comprised of a blend of a thermoplastic orientable polymer and an incompatible second phase selected from the group consisting of an incompatible polymer of inorganic material or a polymer matrix having an inorganic filler.
Claim 3
Dependent Claim
20 words
The opaque low density porous sheet as defined in claim 1 wherein said chemical is an antibrowning agent for meat.
Claim 4
Dependent Claim
18 words
The opaque low density porous sheet as defined in claim 2 wherein said antibrowning agent is nicotinic acid.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |