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. 06, 1988
Filed:
Jun. 22, 1987
Sidney A Ottenstein, Spring, TX (US);
Innovative Controls, Inc., Houston, TX (US);
Abstract
A temperature switch for HID lamp fixtures is provided to enable such lights to be operated at low temperatures on the order of minus forty degrees Celsius, or minus fifteen degrees Fahrenheit. In one embodiment, the switch is comprised of a thermistor circuit and a resistive photocell circuit. When the resistance of either the thermistor or the photocell exceeds the reference value, or when the combined resistance of thermistor and the photocell exceed that value, the HID lamp will be turned on. The lamp is thereby turned on when the ambient temperature becomes very cold, regardless of the amount of ambient light in order that the components of the light fixture may be heated internally for more reliable operation.