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:
Oct. 06, 2015
Filed:
Jan. 25, 2013
Applicant:
Hewlett-packard Development Company, L.p., Houston, TX (US);
Inventors:
Algird M. Gudaitis, Vancouver, WA (US);
David E. Smith, Vancouver, WA (US);
Assignee:
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/42 (2006.01); H03F 3/45 (2006.01); H03F 3/08 (2006.01); G01P 13/00 (2006.01);
U.S. Cl.
CPC ...
H03F 3/45475 (2013.01); G01P 13/0006 (2013.01); H03F 3/087 (2013.01); H03F 2200/261 (2013.01); H03F 2203/45526 (2013.01);
Abstract
A system includes a photodetector, a first amplifier, a second amplifier, and a filter. The photodetector is to detect backscattered light from liquid drops to provide a current signal. The first amplifier is to convert the current signal into a first voltage signal. The second amplifier is to amplify the first voltage signal to provide a second voltage signal, and the filter is to filter the second voltage signal to provide an output signal to indicate the presence or absence of liquid drops.