Method and apparatus for evacuating and closing bags
CA 1060403 A · Owner: W.R. Grace And Co. · Inventors: Hawkins, Robert S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an apparatus for evacuating and closing flexible impervious receptacles such as pouches and bags which have at least one opening and contain at least one product. The apparatus comprises a first vacuum chamber, a second vacuum chamber adjacent to the first one means providing an aperture in flow communication with the chambers for passing a portion of the receptacle containing the opening through the aperture, means to evacuate the chambers independently of each other and to evacuate the receptacle and means to close the receptacle when its evacuation has been completed. Means are provided for effecting an improved seal between the chambers throughout a range of receptacle size …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 14, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 14, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.