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:
Jan. 17, 1978
Filed:
Sep. 29, 1976
Applicant:
Inventor:
Roger E Garrett, Davis, CA (US);
Assignee:
The Regents of the University of California, Berkeley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G21G / ;
U.S. Cl.
CPC ...
250493 ; 250497 ;
Abstract
Especially for use in agricultural machines such as lettuce harvesters having a maturity tester thereon, there is provided a radiation source such as Americium 241 sealed in a capsule at atmospheric pressure. The capsule is disposed in a plunger movable in an evacuated chamber between a first position in alignment with a passage having a window permeable by radiation to the outside and a second position in which the capsule is out of alignment with the passage. A pressure responsive switch monitors the pressure in the chamber and affords an alarm if the chamber pressure rises.