The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2014
Filed:
Jun. 04, 2010
Applicant:
Philip O. Isaacson, Chanhassen, MN (US);
Inventor:
Philip O. Isaacson, Chanhassen, MN (US);
Assignee:
Nonin Medical, Inc., Plymouth, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B 5/05 (2006.01);
U.S. Cl.
CPC ...
Abstract
An apparatus includes a first amplifier having a first input coupled to a first optical detector. The first amplifier includes a first output corresponding to a logarithm of the first input. The apparatus includes a second amplifier having a second input coupled to a second optical detector and having a second output corresponding to a logarithm of the second input. The apparatus includes a differential amplifier configured to amplify a difference between the first output and the second output.