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. 04, 1991
Filed:
Apr. 12, 1990
Carlton L Whiteford, Westport, CT (US);
Other;
Abstract
The bubble vials of a carpenter's level are individually illuminated by a respective light emitting diode (LED) energized from a battery supported within the body of the level. Charge on the batteries is maintained by one or more solar cells mounted on an exterior surface of the body, and the LED's are energized by a control circuit including a normally open manually actuable switch and a pair of mercury switches supported within the body at different fixed orientations relative thereto such that one of them closes when the body is horizontally oriented to apply voltage to the LED for the horizontal bubble vial, and the other closes when the body of the level is vertically oriented and connects the battery to the LED for the bubble vials of the plumbing levels. Thus, the circuit automatically illuminates only the bubble vial, or vials, that need to be illuminated in order to observe the position of the bubble for the orientation selected by the user.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile