US3816575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing a porous thermoplastic resin sheet
Assignee: Lion Fat and Oil Co Ltd
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Filing: 1971-09-10
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Granted: 1974-06-11
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Expires: 1991-09-10
Abstract
Abstract A METHOD FOR PREPARING A POROOUS THEREMOPLASTIC RESIN SHEET COMPRISING THE PROCESSING STEPS OF: FORMING A SHEET WITH A COMPOSITION CONTAINING THERMOPLASTIC RESIN KNEADED TOGETHER WITH ACID-SOLUBLE INORGANIC PARTICLES AND THEN SOAKING THE SHEET THUS OBTAINED IN A TREATING LIQUID CONSISTING OF ACID AQUEOUS SOLUTION FOR DISSOLUTION OF SAID INORGANIC PARTICLES OUT OF SAID SHEET.
Inventors
- 👤 R Susuki
- 👤 H Hoshi
- 👤 H Ito
- 👤 J Saito
- 👤 K Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:56
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C67/202; C; C08; C08J; C08J9/00; C08J9/26
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |