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:
Jan. 13, 1987
Filed:
Nov. 01, 1984
Applicant:
Inventors:
David M Zuk, Ann Arbor, MI (US);
Vernon L Larrowe, Ypsilanti, MI (US);
Assignee:
Environmental Research Institute of Michigan, Ann Arbor, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ;
Abstract
An apparatus for measuring the phase difference between two signals including a precision extender employing a frequency multiplier for each of the signals, apparatus for heterodyning each of the signals back to their original frequencies, and a phase detector for measuring the phase difference of the heterodyned signals.