Configuration of two antennae with signal isolation
CA 1098206 A · Owner: The United States Government As Represented By The Secretary Of The Army · Inventors: Weber, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The configuration consists of two antennae on the same mast. The upper antenna is a ground plane capable of two frequency bands of operation. The lower antenna, comprises a sleeve and radial elements. The upper antenna consists of four radials 36" long and an upper element. The two bands of operation covered by the upper antenna are 80 MHz and 150 MHz. Band selection is accomplished by selection of the correct upper mast element. This element is removable. A 34" long element is used for 80 MHz operation and a 14" long element for 150 MHz operation. This antenna is nondirectional and is used for transmitting. The lower antenna consists of four radials 22" long and an upper and lower sleeve. …
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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 March 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 1998.
- 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.