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US 4,733,057 AGranted
Sheet heater
AssigneeRaychem Corporation
InventorsErwin K. E. Stanzel, Chester L. Sandberg
Life of this patent
Estimating the term…
Abstract
A wall, floor or ceiling heater comprises a plurality of self regulating, preferably PTC conductive polymer, heater elements each of which is connected to two or more connection elements. The elements are held by a support. In a preferred embodiment the heater elements are positioned parallel to each other, and perpendicular to the connection elements. The support is preferably made from a rigid material which is hinged to allow the heater to be folded or rolled for easy transport.
Claims18
A flexible wall, floor or ceiling heater which is in the form of a sheet and which comprises:
- (a) first and second connection elements which can be connected to a source of electrical power;
- (b) a plurality of discrete, elongate, self-regulating electrical heater elements, each of which comprises:
- (i) a first elongate electrode which is connected to the first connection element,
- (ii) a second elongate electrode which is connected to the second connection element, and
- (iii) a plurality of resistive heating elements connected in parallel with each other between the first and second electrodes;
- and
- (c) a flexible support which is in the form of a sheet and to which the heater elements and the connection elements are secured in a substantially fixed spatial relationship in the plane of the sheet, with the heater elements being substantially parallel to each other and spaced apart from each other, and the connection elements being substantially at right angles to the heater elements.
4 more elements
Dependencies are inferred from the claim text.