US3341388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the uniform extruding of thermoplastic film
Assignee: H P SMITH PAPERCO AN IL CORP
•
Filing: 1964-05-20
•
Granted: 1967-09-12
•
Expires: 1984-05-20
Abstract
No abstract record available.
Inventors
- 👤 Edwin D Bunyea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/31; B29C48/313; B29C48/03; B29C48/07; B29C48/08; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92114; B29C2948/92152; B29C2948/92209; B29C2948/92819; B29C2948/92857; B29C2948/92904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE METHOD OF COATING A WEB WITH A THERMOPLASTIC MATERIAL WHICH COMPRISES EXTRUDING MOLTEN THERMOPLASTIC THROUGH A DIE SLOT TO FORM A MOLTEN THERMOPLASTIC SHEET HAVING A WIDTH AT LEAST EQUAL TO THAT OF THE WEB TO BE COATED; WITHDRAWING THE EXTRUDED SHEET AT A SUBSTANTIALLY CONSTANT RATE; CONTACTING A WEB WITH SAID MOLTEN THERMOPLASTIC SHEET; PRESSING THE SHEET AND WEB TOGETHER WITH A SUBSTANTIALLY CONSTANT AMOUNT OF PRESSURE; CONTINUOSLY ADDING HEAT TO THE DIE ACROSS ITS WIDTH IN AN AMOUNT SUBSTANTIALLY EQUIVALENT TO THE HEAT RADIATED FROM THE DIE; CONTINUOUSLY MEASURING THE THICKNESS OF THE COATED WEB AT A PLURALITY OF LOCI ACROSS THE WIDTH OF THE WEB; AND ADDING HEAT TO THOSE AREA OF THE DIE CORRESPONDING TO THE LOCI OF MEASUREMENT OF FILM THICKNESS IN AMOUNTS SUFFCIENT TO MAINTAIN THE THICKNESS OF THE WEB SUBSTANTIALLY CONSTANT.
Claim 2
Independent Claim
139 words
THE METHOD OF COATING A WEB WITH A THERMOPLASTIC MATERIAL WHICH COMPRISES EXTRUDING MOLTEN THERMOPLASTIC THROUGH A DIE SLOT TO FORM A MOLTEN THERMOPLASTIC SHEET HAVING A WIDTH AT LEAST EQUAL TO THAT OF THE WEB TO BE COATED; WITHDRAWING THE EXTRUDED SHEET AT A SUBSTANTIALLY CONSTANT RATE; CONTACTING A WEB WITH SAID MOLTEN THERMOPLASTIC SHEET; PRESSING THE SHEET AND WEB TOGETHER WITH A SUBSTANTIALLY CONSTANT AMOUNT OF PRESSURE; CONTINUOSLY ADDING HEAT TO THE DIE ACROSS ITS WIDTH IN AN AMOUNT SUBSTANTIALLY EQUIVALENT TO THE HEAT RADIATED FROM THE DIE; CONTINUOUSLY MEASURING THE THICKNESS OF THE COATED WEB AT A PLURALITY OF LOCI ACROSS THE WIDTH OF THE WEB; AND ADDING HEAT TO THOSE AREA OF THE DIE CORRESPONDING TO THE LOCI OF MEASUREMENT OF FILM THICKNESS IN AMOUNTS SUFFCIENT TO MAINTAIN THE THICKNESS OF THE WEB SUBSTANTIALLY CONSTANT.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |