Patent US3421964A successfully refreshed from Google Patents.
US3421964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic extrusion coater
Assignee: Beloit Corp
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Filing: 1963-11-27
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Granted: 1969-01-14
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Expires: 1983-11-27
Abstract
No abstract record available.
Inventors
- 👤 Harold A Arbit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:56
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/26; B32; B32B; B32B27/00; D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/30; D21H23/46; D21H23/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A PROCESS OF APPLYING A FILM OF NORMALLY SOLID SYNTHETIC LINEAR POLYMER OF SHARP MELTING POINT TO A POROUS SHEET WHICH PROCESS COMPRISES CARRYING OUT SUBSTANTIALLY SIMULTANEOUSLY THE STEPS OF CONTACTING A MOLTEN FILM OF POLYMER WITH SAID SHEET, PRESSING SAID MOLTEN FILM AGAINST SAID SHEET, APPLYING A PRESSURE DIFFERENTIAL ACROSS SAID SHEET HOLDING THE FILM AGAINST THE SHEET, AND CHILLING THE EXPOSED SURFACE OF SAID MOLTEN FILM TO A TEMPERATURE BELOW THE SOLIDIFICATION POINT OF SAID FILM WHILE SAID PRESSURE DIFFERENTIAL IS MAINTAINED.
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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |