US3291876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and mechanism for biaxially orienting extruded tubular film
Assignee: Beloit Corp
•
Filing: 1964-05-05
•
Granted: 1966-12-13
•
Expires: 1984-05-05
Abstract
No abstract record available.
Inventors
- 👤 Edgar J Justus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:33
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C2793/00; B29C2793/0063; B29C48/001; B29C48/0018; B29C48/0019; B29C48/0022; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE METHOD OF MAKING THIN SHEET FILM WHICH COMPRISES EXTRUDING PLASTIC MATERIAL CONTINUOUSLY FROM AN EXTRUDING HEAD FORMING A TUBE, FLATTENING THE TUBE ACROSS THE WIDTH THEREOF AT A FLATTENING LOCATION SPACED FROM THE EXTRUDING HEAD AND LEAVING AN EDGE PORTION UNFLATTENED, INFLATING THE TUBE WITH AN INFLATING MEMBER THROUGH SAID EDGE PORTION FOR FORMING A BUBBLE BETWEEN THE INFLATING HEAD AND FLATTENING LOCATION, AND SLTTING THE EDGE OF THE TUBE AT SAID EDGE PORTION AND SEPARATING THE FLATTENED TUBE TO ACCOMMODATE INSERTION OF THE INFLATING MEMBER.
Claim 2
Independent Claim
87 words
THE METHOD OF MAKING THIN SHEET FILM WHICH COMPRISES EXTRUDING PLASTIC MATERIAL CONTINUOUSLY FROM AN EXTRUDING HEAD FORMING A TUBE, FLATTENING THE TUBE ACROSS THE WIDTH THEREOF AT A FLATTENING LOCATION SPACED FROM THE EXTRUDING HEAD AND LEAVING AN EDGE PORTION UNFLATTENED, INFLATING THE TUBE WITH AN INFLATING MEMBER THROUGH SAID EDGE PORTION FOR FORMING A BUBBLE BETWEEN THE INFLATING HEAD AND FLATTENING LOCATION, AND SLTTING THE EDGE OF THE TUBE AT SAID EDGE PORTION AND SEPARATING THE FLATTENED TUBE TO ACCOMMODATE INSERTION OF THE INFLATING MEMBER.
References Cited (Backward Citations)
US2750631A
Cited
US2923194A
Cited
US2862234A
Cited
US2832994A
Cited
US2987767A
Cited
US3166616A
Cited
US3092874A
Cited
US3121761A
Cited
US3193547A
Cited
US3170011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |