US3640049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging with heat-shrinkable film
Assignee: AMPAK Inc A CORP OF DE
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Filing: 1969-01-29
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Granted: 1972-02-08
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Expires: 1989-01-29
Abstract
Abstract A stack of articles is packaged in a bag or sheet of heatshrinkable film. Film at the bottom of the stack is not heat shrunk so that individual articles can be removed without destroying the package.
Inventors
- 👤 Richard C Fritz
- 👤 Aldo B Galvanoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:31
CPC Classifications
B; B65; B65B; B65B53/00; B65B53/02; B65B53/06; B65B53/063; B65B2220/00; B65B2220/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
The method of packaging a stack of articles which comprises wrapping the stack of articles in a sheet of heat-shrinkable film, placing the wrapped stack on a movable belt so that the stack rests on one end of the stack, moving the belt with the stack thereon through a heating zone, cooling the belt as it is passed through the heating zone to assist in preventing the film on said end of the stack from being shrunk, and passing a stream of hot air into the heating zone to strike the wrapped stack as the belt moves the stack through the heating zone, whereby the film is shrunk except at said end which rests on the belt so as to be out of contact with the stream of hot air, thereby producing a package which can be opened at said end to permit removal of articles.
Claim 2
Independent Claim
146 words
The method of packaging a stack of articles which comprises wrapping the stack of articles in a sheet of heat-shrinkable film, placing the wrapped stack on a movable belt so that the stack rests on one end of the stack, moving the belt with the stack thereon through a heating zone, cooling the belt as it is passed through the heating zone to assist in preventing the film on said end of the stack from being shrunk, and passing a stream of hot air into the heating zone to strike the wrapped stack as the belt moves the stack through the heating zone, whereby the film is shrunk except at said end which rests on the belt so as to be out of contact with the stream of hot air, thereby producing a package which can be opened at said end to permit removal of articles.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |