Injector/valve combination designed to improve color dosing response time
CA 2299106 A1 · Owner: Ragsdale, Mark E. · Inventors: Chavis, Jimmy D.; Pitman, Frank Mark; Ragsdale, Mark E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved injector/valve combination which permits nearly immediate response time to an actuator signal. Such a combination is, particularly suited for injecting colorants into polyurethane slabstock foam and, permits a substantial reduction in foam waste due to low colorations during an on/off, cycle. Specifically, this invention combination comprises a novel ball valve which, allows for instantaneous shut-off and -on without appreciable leakage or pressure drop, and without the need to utilize a high throughput flow rate. Such a ball valve is used, in combination with an injector which is actually attached to the valve the, configuration which permits …
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
- Filed February 22, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2022.
- 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.