US3666151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for and method of severing film
Assignee: DuPont Canada Inc
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Filing: 1970-08-18
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Granted: 1972-05-30
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Expires: 1990-08-18
Abstract
Abstract Process of severing film including the steps of subjecting the film to heat and pressure along the desired line of parting to weaken the film and cooling the heated area and effecting severing by pulling the film on either side of the line of parting with a snapping action. Apparatus is provided for performing the above described method of severing.
Inventors
- 👤 Gerald B Dyer
- 👤 Edwin Szpak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:35
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/06; B26F3/08; B26F3/002; B29; B29C; B29C67/00; Y; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/30; Y10T225/304; Y10T225/307; Y10T225/321; Y10T225/35
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
A process for severing oriented thermoplastic film or oriented thermoplastic film laminates which comprises subjecting the film to heat and pressure along the desired line of parting to weaken the film, cooling the heated area and effecting severing by pulling the film on either side of the line or parting with a snapping action.
Claim 2
Dependent Claim
54 words
A process for severing oriented thermoplastic film or oriented thermoplastic film laminates which comprises subjecting the film to heat and pressure along the desired line of parting to weaken the film, cooling the heated area and effecting severing by pulling the film on either side of the line or parting with a snapping action.
Claim 3
Dependent Claim
29 words
The process as claimed iN claim 1 in which said thermoplastic material is selected from a list comprising: polyethylene polypropylene polyamide polyolefin polyester polystyrene polyvinylchloride and copolymers of ethylene.
Claim 4
Dependent Claim
32 words
The process of claim 1 wherein the dimensions of the film along the desired line of parting remain substantially the same after being subjected to the heat and pressure and being cooled.
Claim 5
Dependent Claim
107 words
The process for severing a continuous sheet of oriented thermoplastic film or oriented thermoplastic film laminates into separate sections which comprises: subjecting the film to heat and pressure along the desired line of parting to weaken the film, said line of parting having sufficient strength after cooling to permit the continuous sheet to be manipulated and handled but weak enough to permit the various sections of the sheet to be separated from each other by a snapping action; cooling the heated areas; separating the sections of the sheet from one another by pulling the film on either side of the line of parting with a snapping action.
Claim 6
Dependent Claim
107 words
The process for severing a continuous sheet of oriented thermoplastic film or oriented thermoplastic film laminates into separate sections which comprises: subjecting the film to heat and pressure along the desired line of parting to weaken the film, said line of parting having sufficient strength after cooling to permit the continuous sheet to be manipulated and handled but weak enough to permit the various sections of the sheet to be separated from each other by a snapping action; cooling the heated areas; separating the sections of the sheet from one another by pulling the film on either side of the line of parting with a snapping action.
Claim 7
Dependent Claim
27 words
The process of claim 4 in which said thermoplastic material is selected from a list comprising: polyethylene polypropylene polyamide polyolefin polyester polystyrene polyvinylchloride and copolymers of ethylene.
Claim 8
Independent Claim
83 words
An apparatus for severing oriented thermoplastic film or oriented thermoplastic film laminate which comprises: a conveyor means for transporting the film; a heated bar adapted to be brought into pressure contact with said film along a predetermined line; means to cool the area of the film heated by said heated bar; and means to grip the film on either side of said predetermined line of contact with said heated bar and adapted to produce a snapping action on said film to effect parting.
Claim 9
Independent Claim
83 words
An apparatus for severing oriented thermoplastic film or oriented thermoplastic film laminate which comprises: a conveyor means for transporting the film; a heated bar adapted to be brought into pressure contact with said film along a predetermined line; means to cool the area of the film heated by said heated bar; and means to grip the film on either side of said predetermined line of contact with said heated bar and adapted to produce a snapping action on said film to effect parting.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |