US3767523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic paper base and method of manufacture
Assignee: Kimberly Clark Corp
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Filing: 1971-04-12
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Granted: 1973-10-23
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Expires: 1991-04-12
Abstract
Abstract Improved synthetic paper base material manufactured by coextrusion of a layer of polymeric material having good physical properties with one or more layers of a different polymeric material having good printability. Adhesion between the layers is increased by including in each a minor amount of an ethylenevinyl acetate copolymer.
Inventors
- 👤 E Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:33
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/30; B32B27/302; B32B27/306; B32B27/32; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B2307/00; B32B2307/70; B32B2307/75; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
The composite of claim 1 wherein at least one of said layers contains an opacifying pigment.
Claim 2
Dependent Claim
21 words
The composite of claim 1 wherein the weight of polypropylene in the composite is about equal to the weight of polystyrene.
Claim 3
Dependent Claim
26 words
The composite of claim 1 wherein the combination comprises a central layer of the blend including polypropylene and two surface layers of the blend including polystyrene.
Claim 4
Dependent Claim
19 words
The composite of claim 4 wherein each of said surface layers is one-half the thickness of said central layer.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |