Patent US3556934A successfully refreshed from Google Patents.
US3556934A
Expired / Lapsed
US
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Method of forming a paper containing gaseous filled spheres of thermoplastic resins
Assignee: Casco Adhesives AB
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Filing: 1967-11-27
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Granted: 1971-01-19
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Expires: 1987-11-27
Abstract
Abstract PAPERS CONTAINING EXPANDED THERMOPLASTIC MICROSPHERES ARE PREPARED BY INCORPORATING AN EXPANDABLE THERMOPLASTIC MICROSPHERE WITHIN THE PULP SLURRY AND THE PAPER DRIED AT ABOUT 90*C., CAUSING THE MICROSPHERES TO FOAM. THIS PHENOMENON APPEARS TO BE PECULIAR TO MICROSPHERES HAVING A VINYLIDENE CHLORIDE-ACRYLONITRILE COPOLYMER SHELL.
Inventors
- 👤 Fred J Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:30
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/50; D21H21/52; D21H21/54
Claims Analysis
Total Claims: 0
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |