US3817771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing synthesis resin films of improved stiffness
Assignee: Mitsui Chemicals Inc
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Filing: 1971-08-17
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Granted: 1974-06-18
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Expires: 1991-08-17
Abstract
Abstract MICROVOIDS FORMED IN AT LEAST REGIONS NEAR THE OUTER SURFACE OF A BASIC SYNTHETIC-RESIN FILM AND COMMUNICATING WITH THE OUTSIDE ARE FILLED WITH A POLYMERIZABLE MONOMER, WHICH IS THEN POLYMERIZED WITHIN THE MICROVOIDS, WHEREBY THE STIFFNESS AND OTHER CHARACTERISTICS OF THE FILM ARE IMPROVED. THE BASIC SYNTHETIC-RESIN FILM IS PREFERABLY A FILM OF A POLYOLEFIN, PREFERABLY A HOMO- OR COPOLYMER OF ETHYLENE, PROPYLENE, OR BUTENE-1, WHILE THE MONOMER IS AN ETYLENICALLY UNSATURATED MONOMER.
Inventors
- 👤 Y Nakayama
- 👤 M Yoshiyasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; B; B29; B29D; B29D7/00; B29D7/01; B44; B44D; B44D3/00; B44D3/18; Y; Y10; Y10S; Y10S428/00; Y10S428/91
Claims Analysis
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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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |