Variable magnification lens system
CA 1081512 A · Owner: Xerox Corporation · Inventors: Spurles, Louise L.; Price, Edgar E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable magnification lens is exemplified by a 6-element symmetrical zoom lens for use between fixed conjugates at magnification ranging from 1.007X to 0.615X. The outer elements remain fixed relative to the unit. The inner elements form two integral pairs on each side of the central aperture and move symmetrically with respect to it to effect magnification change while maintaining a substantially flat image field over the entire magnification range.
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 July 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 1997.
- 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.