Water mattress construction
CA 1057428 A · Owner: Calleance, David P. · Inventors: Calleance, David P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water mattress construction which includes an interior perametrical air chamber comprises three similar web portions of polyvinyl material or the like. The mattress is formed by first securing an air valve through the top sheet near the edge thereof. A first seam which is spaced, inwardly from the perimeter of the sheets is then made to join the upper, and medial web portions. A water valve is then secured through the upper and medial web portions, and is secured within the confines of the first seam. A second, peremetrical seam is then made to join the outer edges of all three web portions. The chamber defined by the upper and medial web portions and the two seams is filled with air and …
Read the whole patent
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 June 26, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 26, 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.