Patent US3658978A successfully refreshed from Google Patents.
US3658978A
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US
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Calendering of polymeric materials
Assignee: Union Carbide Corp
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Filing: 1969-07-07
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Granted: 1972-04-25
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Expires: 1989-07-07
Abstract
Abstract PROCESS AND APPARATUS FOR THE CALENDERING OF POLYMERIC MATERIAL COMPRISING FEEDING SAID POLYMERIC MATERIAL THRU THE NIP OF A CALENDER HAVING A PAIR OF COUNTER-ROTATING ROLLS WHILE MAINTAINING A VOLUMETRIC OBSTRUCTION ACROSS THE WIDTH AND BETWEEN THE PAIR OF CALENDER ROLLS, THE MOST DOWNSTREAM PROJECTION OF SAID OBSTRUCTION BEING POSITIONED SO AS TO AT LEAST PENETRATE THE BANK OF MATERIAL FORMED BETWEEN THE PAIR OF CALENDER ROLLS UPSTREAM OF THE NIP BY THE SELECTION OF CALENDERING CONDITIONS AND WHILE CONCURRENTLY FEEDING A STREAM OF POLYMERIC MATERIAL TO SAID NIP OPENING ON EACH SIDE OF SAID VOLUMETRIC OBSTRUCTION.
Inventors
- 👤 Fred H Ancker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:54
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/52; B29C70/525; B29C43/00; B29C43/22; B29C43/24; B29C44/00; B29C44/20; B29C44/30; B29C44/34; B29C44/36; B29C44/46; B29C44/48; B29C44/485; B29C48/00; B29C48/001; B29C48/0013; B29C48/0014; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/35; B29C70/504; B29C43/32; B29C43/44; B29C43/46; B29C48/0017; B29C48/0019; B29L; B29L2009/00
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |