Gas diffusion-limited controlled-release devices
CA 1196245 A · Owner: Commonwealth Scientific And Industrial Research Organization · Inventors: Kautzner, Bruno; Laby, Ralph H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for controllably delivering a solid paste, or liquid material in biological environmental or, industrial systems. The device is in the form of a tubular body, one end of which is open to allow egress of the material, and the other is closed. A gas-tight plunger slides within the body by virtue of spring driving means and gas from the external environment which enters the closed end of the tubular body by way of a gas permeable membrane and acts, together with the spring on the rear face of the plunger. The plunger controllably ejects the material from the open end of the device. The device has particular use in the delivery of therapeutic and/or prophylatic materials to animals.
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 November 5, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 5, 2002.
- 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.