Production of master recording media
CA 2432017 A1 · Owner: Quinn, John · Inventors: Quinn, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A CD master production system (1) has a pre-recording station (2) with a central robotic arm (6) for loading and unloading discs onto a succession of processing devices (19-24) including washing and resist application devices. An LBR station (3) performs laser recording on up to four substrate discs (D) at a time, mounted on spindles (41). There is real time recording head (51) height adjustment for focusing the recording beam to compensate for disc level variations. A sensing beam reflected from the disc is compared with a reference beam so that the phase difference indicates level variations. A postrecording station (4) performs post-recording operations again with disc , …
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 December 20, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2023.
- 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.