This inventor holds 3 USPTO granted patents. Top assignees: Synoptics Limited, Other. Active years: 1981-1987.
Location History:
- La Honda, CA (US) (1981)
- Sunnyvale, CA (US) (1987)
Company Filing History:
1 out of 7 
2 out of 834,411 Years Active: 1981-1987
Title: Innovations of John K Landre
Introduction
John K Landre is a notable inventor based in Sunnyvale, California. He has made significant contributions to the field of endoscopy through his innovative designs and patents. With a total of 3 patents to his name, Landre's work exemplifies the intersection of technology and medical applications.
Latest Patents
One of his latest patents is the Variable Magnification Endoscope. This endoscope allows for continuous variation of magnification from zero to a microscopic level of 40x or more. It provides full correction for aberrations across a wide range of magnifications. The design includes a positive lens group in a microscope objective configuration, along with a front group that typically features a negative lens. To achieve high magnification, the objective is positioned in contact with the object being viewed. This configuration allows the positive lens group to function effectively as a microscope objective while minimizing aberrations from the negative lens group. At lower magnifications, the negative lens group works in conjunction with the positive lens group to create a wide-angle lens. Pupil stabilization is achieved by strategically placing a physical stop, ensuring maximum numerical aperture consistent with the positive lens group's diameter. The design also allows for effective image transfer using conventional means such as alternating field and relay lenses.
Career Highlights
Throughout his career, John K Landre has worked with various companies, including Synoptics Limited. His experience in the field has contributed to advancements in medical imaging technologies.
Collaborations
Landre has collaborated with notable professionals in his field, including Jan Hoogland. Their joint efforts have furthered the development of innovative solutions in endoscopy.
Conclusion
John K Landre's contributions to the field of endoscopy through his patents and collaborations highlight his role as a significant inventor. His work continues to influence advancements in medical technology.