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:
Jun. 19, 2001
Filed:
May. 27, 1999
Richard C. Anderson, San Jose, CA (US);
Davis Instruments, Hayward, CA (US);
Abstract
A cylindrical housing is provided with outside protecting louvers and central cylindrical aspirated flow paths. First, the surrounding louvers are circular and slope downward at their cylindrical inner and outer edges so as to deflect radiation outwardly of the shield and permit cooling by ambient wind. Second, these surrounding louvers along the upper surface are each provided with vertical convection flow apertures to permit natural convection currents. Third, the housing and the louvers are given a small spatial separation to prevent heat conduction. Fourth, a motor driven fan is placed at the top of the central cylindrical flow path. Air is drawn from the bottom of the housing at a screen-guarded circular opening. Air then passes around an aerodynamically shaped radiation baffle into the sensor chamber of the shield. Fifth, air drawn between the walls of the protecting housing is drawn along at least two flow paths. A first flow path travels along the length of the inside surface of the outer wall of the housing. A second cylindrical-shaped stream of traveling air provides cooling to the wall immediately surrounding the measuring sensor. Finally, a solar powered fan motor and battery circuit is provided with a resistor in series with the battery. The fan motor powering circuit enables increased aspiration during direct sunlight hours, limits solar cell charging current to the during sunlight hours, and finally reduces discharge current during non sunlight hours to prolong battery driven fan operation. Maximum accuracy of temperature and humidity measurement is enabled.