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:
Apr. 10, 2001
Filed:
Jul. 31, 1998
Kevin G. Hafer, Mt. Penn, PA (US);
L. Jonathan Kramer, Warmister, PA (US);
Other;
Abstract
A measuring system for measuring a variable physical parameter by varying a reference signal above and below the magnitude of the physical parameter. The difference between the varying reference and the varying physical parameter is used to create an output signal representative of the magnitude of the parameter. A preferred embodiment of the invention uses a feedback-controlled system to vary the reference in such manner as to cause the time integral of the difference to be minimized. The reference is varied at a controlled rate, and the direction in which the reference is being varied is reversed when a function of the difference reaches some predetermined level. A function of the limits between which the reference has recently been varied is representative of the magnitude of the physical parameter.