Formulation of stable water based suspensions of mixtures oftrihaloalkyl sulfone
CA 2000282 A1 · Owner: Dahanayake, Manilal · Inventors: Dahanayake, Manilal; Paterson, Donald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to tri halo alkyl sulfone and mixtures of bis(trichloro methyl) sulfone (BTCMS) and an auxiliary biocide such as methylene bis(thiocyanate) (MBT) formulated as a stable suspension in water. The process of formulation comprises adding the BTCMS to water containing a swellable smectite clay then, adding the MBT, a suitable amount of a thickening or stabilizing agent and a surfactant. Preferably, magnesium aluminum silicate is the swellable smectite clay and the thickening agent is xanthan gum or hydroxypropyl methyl cellulose. These formulations are useful as biocides and present advantages over organic solvent based formulations.
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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
- Filed October 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2011.
- 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
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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.