US3555136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a porous sheet
Assignee: Rhone Poulenc SA
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Filing: 1967-06-27
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Granted: 1971-01-12
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Expires: 1987-06-27
Abstract
Abstract POROUS SHEETS ARE MADE BY DEPOSITING ON A SUPPORT A LAYER OF A MIXTURE OF FUSIBLE POWDER AND SHRINKABLE THERMOPLASTIC FIBRILS AND HEATING THE LAYER FROM THE SIDE IN CONTACT WITH THE SUPPORT.
Inventors
- 👤 Paul Rouault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:29
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/50; C; C08; C08J; C08J9/00; C08J9/24; D04H1/42; D04H1/4282; D04H1/58; D04H1/587; D04H1/60; D04H13/00
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |