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:
Feb. 13, 1979
Filed:
Nov. 21, 1977
Applicant:
Inventor:
Richard L Walker, Amherst, NH (US);
Assignee:
M.F.E., Inc., Salem, NH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
346 / ; 219216 ;
Abstract
The resistive stylus in a thermographic strip chart recorder is connected by way of an adjustable selector switch to taps of an auxiliary secondary winding added to the D.C. inverter customarily used to power the recorder's pen motor. The amount of current to the stylus and thus the stylus temperature may be varied in accordance with recorder chart speed by adjusting the selector switch to connect the desired number of secondary winding turns to the stylus.