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:
May. 26, 1981
Filed:
Mar. 19, 1979
William B Baker, Newark, DE (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
An improved dosimeter designed for individual use that has a filter for collecting particles or vapors present in an air stream being pumped through the dosimeter, a variable drive pump that draws the air stream through the filter, an electric motor coupled to the variable drive pump, an electric power source for the motor, an air reservoir connected to the pump, an orifice position in a tube attached to the air reservoir which creates a pressure drop in the air stream, a differential pressure switch positioned before the orifice that is activated by a change in air pressure and creates a low voltage electrical input signal; an integrator circuit that uses the low voltage input signal of the pressure switch and integrates this signal, an amplifier circuit which amplifies the signal from the integrator circuit and feeds the signal to the electric motor thereby controlling the speed of the motor driving the pump in relationship to the signal generated by the pressure switch to maintain the air stream at a constant flow rate; the improvement that is used therewith is as follows:
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile