Sperika Enterprises Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5854472 Low-voltage and low flux density heating systemExpiredJun 06, 96Dec 29, 98[H05B]
5814792 Extra-low voltage heating systemExpiredJun 26, 96Sep 29, 98[H05B, H04B, H01C]
5811767 Three wire, three-phase heating cable and systemExpiredDec 16, 96Sep 22, 98[H05B]

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