Patent US4537011A successfully refreshed from Google Patents.
US4537011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum packaging
Assignee: Cryovac LLC
•
Filing: 1982-11-26
•
Granted: 1985-08-27
•
Expires: 2002-11-26
Abstract
Abstract The invention provides a method of vacuum packing by defining a "dummy product" 17 alongside a product article 14 on a support sheet so that any "webbing" 18 is to the side of that projection 17 which faces away from the adjacent product article 14. That projection 17 can subsequently be trimmed to leave a webbing-free pack. Cutting down webbing reduces the risk of leakage of the pack. Preferably the height of the projection 17 is adjusted in response to the height of a product article 14 so that the extent of such webbing 18 is at a minimum.
Inventors
- 👤 Ermanno Bortolani
- 👤 Sandro Brembilla
- 👤 Enzo Vassarotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:31
CPC Classifications
B; B65; B65B; B65B11/00; B65B11/50; B65B11/52
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
Apparatus for vacuum packaging comprising: (a) a vacuum chamber adapted to receive a support sheet and a cover film over the support sheet; (b) means for evacuating a space between the cover film and support sheet to form a vacuum pack of the cover film sealed to the support sheet around a product article; (c) upstanding adjustable rib-like means projecting into the chamber once the chamber is closed, said means defining a cover film collector to absorb cover film material which would otherwise form webbing on a product article being packed; and, (d) means for retracting said rib-like means and for extending it into the chamber.
Claim 2
Dependent Claim
106 words
Apparatus for vacuum packaging comprising: (a) a vacuum chamber adapted to receive a support sheet and a cover film over the support sheet; (b) means for evacuating a space between the cover film and support sheet to form a vacuum pack of the cover film sealed to the support sheet around a product article; (c) upstanding adjustable rib-like means projecting into the chamber once the chamber is closed, said means defining a cover film collector to absorb cover film material which would otherwise form webbing on a product article being packed; and, (d) means for retracting said rib-like means and for extending it into the chamber.
Claim 3
Dependent Claim
39 words
Apparatus according to claim 1 wherein said vacuum chamber comprises a flat base having said means defining said upstanding collector formations therein, and a chamber cover defining a cavity which closes onto said base when the chamber is closed.
Claim 4
Dependent Claim
46 words
Apparatus according to claim 2 further characterized by including means for feeding a support sheet to the chamber while the chamber is in an open condition; means for feeding a cover film to the chamber while in an open condition; and, means for closing the chamber.
References Cited (Backward Citations)
US2958172A
Cited
US2976658A
Cited
US3260032A
Cited
US3279144A
Cited
US3299604A
Cited
US3326372A
Cited
US3648428A
Cited
US3861529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |