US2963746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of porous sheet material from powdered polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1958-03-18
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Granted: 1960-12-13
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Expires: 1978-03-18
Abstract
No abstract record available.
Inventors
- 👤 Webb Walter Weston
- 👤 Duerden Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:59
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS FOR THE MANUFACTURE OF A SELF-SUPPORTING SHEET OF POLYMERIC MATERIAL COMPRISING THE STEPS OF FEEDING NON-SPHERICAL, NON-CENOSPHERICAL, UNLUBRICATED PARTICLES OF A GRANULAR POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE POLYMERS PREPARED BY POLYMERIZATION OF VINYL CHLORIDE IN BULK, VINYL CHLORIDE POLYMERS PREPARED BY POLYMERIZATION OF VINYL CHLORIDE IN SOLUTION, VINYL CHLORIDE POLYMERS PREPARED BY GRANULAR
Claim 2
Dependent Claim
60 words
A PROCESS FOR THE MANUFACTURE OF A SELF-SUPPORTING SHEET OF POLYMERIC MATERIAL COMPRISING THE STEPS OF FEEDING NON-SPHERICAL, NON-CENOSPHERICAL, UNLUBRICATED PARTICLES OF A GRANULAR POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE POLYMERS PREPARED BY POLYMERIZATION OF VINYL CHLORIDE IN BULK, VINYL CHLORIDE POLYMERS PREPARED BY POLYMERIZATION OF VINYL CHLORIDE IN SOLUTION, VINYL CHLORIDE POLYMERS PREPARED BY GRANULAR
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |