Guide apparatus
CA 2091314 C · Owner: Ward, Paul Courtenay · Inventors: Kingdon, Stephen John; Pummell, Leslie James Horace; Oldfield, James Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is well-known to use grooves to guide photographic material through processing apparatus. However there is a tendency for debris to accumulate in the bottom of the grooves. Furthermore the, machining operation needed to form such grooves is complicated in particular where bends and changes in direction are required. Described herein is a guiding arrangement in which pairs of parallel plates (20 22, 24, 26) are used to define a gap (30) through which material (40) is transported. The arrangement comprises an upper plate pair (20, 22) which is arranged to be offset with respect to a lower plate pair (24, 26), the plates in each pair being parallel to one another.
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 9, 1993 and granted September 8, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2015.
- 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.