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Expired Canadian patentCanada

Liquid detergents containing surfactant, proteolytic enzyme and boric acid

CA 1302925 C · Owner: Venegas, Manuel G. · Inventors: Venegas, Manuel G.

CIPO record

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Abstract From the Canadian patent

Abstract of the Disclosure Liquid detergent compositions containing synthetic surfactant, specific proteolytic enzyme boric acid or a, boron compound capable of forming boric acid in the composition, and calcium ion are disclosed. The compositions exhibit improved enzyme stability because boric acid stabilizes the proteases herein to a greater degree than it does other proteases. Preferred laundry detergent compositions containing anionic surfactant and detergency builder also provide improved cleaning performance, particularly through-the-wash on enzyme-, sensitive stains.

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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 June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 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.
FiledApril 14, 1986
GrantedJune 9, 1992
Term endedJune 9, 2009
Patent numberCA 1302925 C
Classification (IPC)C11D3/38

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedApril 14, 1986Patent grantedJune 9, 1992Term endedJune 9, 2009

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.