Negative abbe number radial gradient index relay, method of making, and use of same
CA 2113581 C · Owner: Gradient Lens Corporation · Inventors: Hensler, J. Raymond; Moore, Duncan T.; Atkinson, Leland G. Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Radial gradient index of refraction (GRIN) optical relays for overcorrecting axial chromatic aberration and a method for their manufacture are described. A relay including a radial GRIN rod in combination with a holographic optical element or simple homogeneous or GRIN lenses, is described for adjusting axial chromatic and monochromatic aberrations including spherical, coma, astigmatism and distortion. The invention also describes remote viewing scopes such as endoscopes and borescopes, which utilize said relays for achromatic and reduced or corrected monochromatic aberration imaging. The use of segmented said relays provides a slight degree of flexibility in certain remote viewing scopes. …
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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 January 17, 1994 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.