Hot melt adhesive applicator and temperature control circuit therefor
CA 1301284 C · Owner: Dennison, Richard L. · Inventors: Dennison, Richard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hot melt adhesive applicator operable at a number of selected temperatures having a portion of the circuitry for control of the applicator temperature at a point remote from the applicator body. The remotely located circuitry employs a differential amplifier (39) and a zero crossing detector (38) for controlling the operation of a triac (41) which, when turned on, increases the temperature at the applicator. The differential amplifier (39) is protected by a clamping circuit (66-6n) from receiving a signal, when a temperature setting is changed from a high to a low setting, that would otherwise cause the differential amplifier (39) to provide an output required for turning on the triac …
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 May 19, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 2009.
- 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.