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:
Dec. 22, 1987
Filed:
May. 08, 1985
Duane B Haagensen, Edina, MN (US);
Darcy C Moses, Rush City, MN (US);
Leonard S Smith, Minneapolis, MN (US);
Other;
Abstract
The microwave apparatus for processing dielectric materials includes a number of tunable cavity devices arranged vertically one above the other, each having a movable piston. Dielectric conduit means extend downwardly through all of the cavity devices, passing through the various movable pistons. Each tunable cavity device has a microwave generator associated therewith so as to supply controlled amounts of power at frequencies depending upon the type of material being processed. The processing is monitored by additional cavity devices, each having a movable piston. Whereas the pistons of the power cavity devices are positioned so as to cause the material being processed to absorb a maximum amount of microwave power, the pistons in the monitoring devices are positioned so that a detectable amount of power is reflected. The amount of reflected power is indicative of an electrical characteristic, such as moisture. A signal is derived from each of the monitoring devices for controlling the amount of power to the power cavity device with which it is associated. Graphs are employed so that the optimum position for a given plunger can be selected for the greatest amount of absorption (or the least amount of reflection) to be attained and in order to determine the amount of microwave power to be supplied to a particular power cavity device.