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. 08, 1985
Filed:
Aug. 25, 1983
Susumu Ubukata, Nagoya, JP;
Yasukazu Mizutani, Nagoya, JP;
Susumu Ubukata, Nagoya, JP;
Abstract
A seismosensitive device comprises a hermetically sealed enclosure having a recess at the bottom, a first annular surface provided around the recess and having a radial gradient substantially of horizontal level and a second annular surface provided around the first annular surface and progressively diverging from the lower to upper portions with a slope having a gradient greater than that of the first annular surface. A switch assembly comprising a drop of mercury placed at the recess, an electrode bar provided with the enclosure, a needle contact secured to the electrode bar to have its lower end immersed into the drop is provided. When the mercury drop moves along the gradient surfaces significantly smoothly to separate from the needle contact upon tremor of the earth, the switch will open.