Patent US3928938A successfully refreshed from Google Patents.
US3928938A
Expired / Lapsed
US
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Method for evacuating packages
Assignee: WR Grace and Co
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Filing: 1974-06-19
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Granted: 1975-12-30
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Expires: 1994-06-19
Abstract
Abstract A filled flexible receptacle such as a thermoplastic bag containing a food product is evacuated by placing the filled portion of the bag in a first vacuum chamber; extending the neck of the bag into a second and adjacent chamber; evacuating the first chamber thereby causing the bag to balloon outwardly away from the product; and, while the first chamber is being evacuated, evacuating the second chamber and, consequently, evacuating the interior of the ballooned bag; thereafter, when evacuation of the bag is complete, elevating the pressure in the first chamber to collapse the bag firmly around the product and immediately closing the bag thereby making an evacuated package.
Inventors
- 👤 William E Burrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:59
CPC Classifications
B; B65; B65B; B65B31/00; B65B31/02; B65B31/024
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
In the process of evacuating filled thermoplastic bags, pouches, and the like, the improvement which comprises: a. providing adjacent first and second vacuum chambers with an aperture connecting said chambers; b. placing the filled portion of the bag in the first vacuum chamber, c. extending the neck of the bag into the second and adjacent vacuum chamber, said bag neck passing through said aperture whereby the mouth of said bag is unrestrained and open within the second chamber, d. evacuating the first chamber; and, subsequently, e. evacuating the second chamber at a more rapid rate than said first chamber is evacuated, thereby evacuating said bag, f. stopping the evacuation of the said chambers when the evacuation of the second is completed, g. closing and sealing said bag; and, h. removing said sealed bag from said first chamber.
Claim 2
Dependent Claim
137 words
In the process of evacuating filled thermoplastic bags, pouches, and the like, the improvement which comprises: a. providing adjacent first and second vacuum chambers with an aperture connecting said chambers; b. placing the filled portion of the bag in the first vacuum chamber, c. extending the neck of the bag into the second and adjacent vacuum chamber, said bag neck passing through said aperture whereby the mouth of said bag is unrestrained and open within the second chamber, d. evacuating the first chamber; and, subsequently, e. evacuating the second chamber at a more rapid rate than said first chamber is evacuated, thereby evacuating said bag, f. stopping the evacuation of the said chambers when the evacuation of the second is completed, g. closing and sealing said bag; and, h. removing said sealed bag from said first chamber.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said sealed bag is removed from said first chamber and delivered to a conveying means.
Claim 4
Dependent Claim
139 words
A process of evacuating and closing flexible, impervious receptacles such as pouches, bags and the like which have at least one opening and contain at least one product comprising the steps of: a. confining the product containing portion of said receptacle within a first region; b. confining a portion of the receptacle which contains said opening in a second region so that the interior of said receptacle is in communication witH said second region through said opening; c. reducing the pressure within said first region thereby causing at least a part of said receptacle to move outwadly away from contact with said product; and, subsequently, d. reducing the pressure within said second region to evacuate the interior of said receptacle so that the receptacle again contacts the product; and, e. closing said opening thereby making an evacuated, sealed, package.
Claim 5
Dependent Claim
139 words
A process of evacuating and closing flexible, impervious receptacles such as pouches, bags and the like which have at least one opening and contain at least one product comprising the steps of: a. confining the product containing portion of said receptacle within a first region; b. confining a portion of the receptacle which contains said opening in a second region so that the interior of said receptacle is in communication witH said second region through said opening; c. reducing the pressure within said first region thereby causing at least a part of said receptacle to move outwadly away from contact with said product; and, subsequently, d. reducing the pressure within said second region to evacuate the interior of said receptacle so that the receptacle again contacts the product; and, e. closing said opening thereby making an evacuated, sealed, package.
References Cited (Backward Citations)
US3832824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |