Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1992-11-13
1995-07-11
Evans, Geoffrey S.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
H05B 336
Patent
active
054323223
ABSTRACT:
The improved heating pad includes a flexible, thin film heating element with two independent semiconductor circuits printed on an electrically insulating surface, laminated between overlying and underlying organic polyester sheets, and electrically connected to an external power source, wherein the heating element is hermetically sealed in an outer organic polymer covering. Thermostats are positioned directly over the semiconductive circuit traces. The circuit traces are connected in parallel by a multi-position switch, with each circuit capable of being energized separately or in combination, and each circuit capable of providing heat over the entire area of the pad. A circuit protective device provides a varistor across the power supply and a fast-acting fuse in series with the circuit traces.
REFERENCES:
patent: 1960120 (1934-05-01), Mohring
patent: 2122650 (1938-07-01), Keene
patent: 2154184 (1936-02-01), Roberts
patent: 2715674 (1955-08-01), Abbott et al.
patent: 2745942 (1956-05-01), Cohen
patent: 2795680 (1957-06-01), Peck
patent: 2936360 (1960-05-01), Suarez
patent: 3130289 (1964-04-01), Katzman et al.
patent: 3547725 (1970-12-01), Shomphe et al.
patent: 3668367 (1972-06-01), Williams
patent: 3996447 (1976-12-01), Bouffard et al.
patent: 4139763 (1979-02-01), McMullan et al.
patent: 4149066 (1979-04-01), Niibe
patent: 4210216 (1980-07-01), Godden
patent: 4429215 (1984-01-01), Sakai et al.
patent: 4429216 (1984-01-01), Brigham
patent: 4450496 (1984-01-01), Doljack et al.
patent: 4485297 (1984-11-01), Grise
patent: 4523085 (1985-06-01), Grise
patent: 4542285 (1985-09-01), Grise
patent: 4574186 (1986-03-01), Sakai et al.
patent: 4626664 (1986-12-01), Grise
patent: 4633068 (1986-12-01), Grise
patent: 4656339 (1987-04-01), Grise
patent: 4659905 (1987-04-01), Gabrosek et al.
patent: 4690347 (1987-09-01), Grise
patent: 4717812 (1988-01-01), Makita
patent: 4746838 (1988-05-01), Kay
patent: 4749844 (1988-06-01), Grise
patent: 4774397 (1988-09-01), Grise
patent: 4788417 (1988-11-01), Gratlind
patent: 4814586 (1989-03-01), Grise
Carroll John W.
Himes Thomas C.
Ingram Aaron N.
Wise Richard A.
Bruder Healthcare Company
Evans Geoffrey S.
LandOfFree
Electric heating pad does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric heating pad, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric heating pad will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-504696