Salts of carboxymethylcellulose
CA 1279313 C · Owner: Hercules Incorporated · Inventors: Gelman, Robert Alan; Cwirko, Eleanor Hawkins
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of Disclosure Disclosed are novel sodium salts of carboxymethylcellulose (CMC) prepared from a cellulose furnish having a degree of polymerization (D.P.) of greater than 1,000 and having a degree of substitution (D.S.) of 0.2 to 0.9 characterized in that the CMC has an absorbency of at least 25 g. liquid/g. CMC and is a substantially nonfibrous particulate material; and to processes for preparing same. Owing to their high absorbency properties, they are particularly useful in the manufacture of disposable nonwoven products such as adult, incontinence pads, feminine hygiene products disposable, diapers and surgical dressings.
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 January 22, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 2008.
- 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.