Open bottomed spinner for mineral fibers
CA 2037426 C · Owner: Lee, Yee · Inventors: Lee, Yee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spinner for centrifuging molten glass into glass fibers comprises a spinner peripheral wall having orifices for forming mineral fibers, and an annular spinner bottom wall defining an open bore, the bottom wall being connected at its outer periphery to the peripheral wall and adapted to receive a stream of molten glass a central hub, and spoke members connecting the hub and the bottom wall to enable rotational force to be transferred from the hub to the peripheral wall, the spoke members enabling a substantial flow of air downwardly through the bore.
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 March 1, 1991 and granted January 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 2013.
- 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.