Biodegradable absorbent pads and method and apparatus for making
CA 2205658 C · Owner: Gerstenberger, Roland W. · Inventors: Gerstenberger, Roland W.; Buck, Robert L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A biodegradable feminine hygienic interlabia pad (12) which includes a biodegradable inner absorbent sliver (13) made of cotton or rayon and a biodegradable outer cover (15, 34) also made of cotton or rayon. The edges (78, 80) of the outer cover (15, 34) are sewn together to form a hollow cylinder. Also disclosed are a method and an apparatus for manufacturing the pads (12). A rope (16) of absorbent material and a web of the outer covering (34) are brought together in a die (26). The die (26) in the form of a hollow tube (50) and a tapered guide (56) which causes the outer covering to enclose the absorbent material (16) with the seam for the outer covering (34) being on the inside …
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 November 24, 1995 and granted February 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 2017.
- 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.