Patent US1988807A successfully refreshed from Google Patents.
US3741841A
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Production of synthetic papers
Assignee: Yupo Corp
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Filing: 1971-06-23
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Granted: 1973-06-26
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Expires: 1991-06-23
Abstract
Abstract A POLYPROPYLENE RESIN CONTAINING FROM 0.2 TO 30 PERCENT BY A VOLUME OF A FINE FILLER FOR A PAPER-LIKE LAYER IS LAMINATED ONTO AT LEAST ON SURFACE OF A BASE LAYER FILM STRETCHED IN A LONGITUDINAL DIRECTION AND FORMED FROM A MIXTURE OF POLYPROPYLENE RESIN AND AN ADDITIVE OF A TYPE AND QUANTITY SUCH AS TO LOWER THE LOWER OF THE TEMPERATURE RANGE WHEREIN THE RESIN IS PRACTICALLY STRETCHABLE, AND THE COMPOSITE STRUCTURE THUS IS OBTAINED IS HEAT STRETCHED IN A TRANSVERSE DIRECTION AND THEN COOLED AS IT IS HELD IN ITS STRETCHED STATE. THE ADDITIVE CAN BE PLASTICIZER POLYMER O A FINE FILLER.
Inventors
- 👤 T Toyoda
- 👤 Y Miyabe
- 👤 Y Ooba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:46
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/043; B; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B29C55/026; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/22; B32B27/32; C08J7/0427; C08J7/046; B32B38/00; B32B38/0012; B32B2038/0028; B32B2323/00; B32B2323/10; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |