US Patent: Self-regulating semi-conductive flexible heating element

US Patent number: 9,603,196

Inventor: O. Stephan Irgens

US Patent: Power Supply

US Patent number: 8,279,033 B2

Inventor: O. Stephan Irgens

EU Patent: Flexible Heating Element

EU Patent number: EP 0 773 704 B1

Inventor: O. Stephan Irgens

STEP® – Stands for Self-regulating Technology of Electro Plastics -  Reg. No. 4,303,643

STEP Warmfloor® – brand name for semi-conductive self-regulating heating elements and systems  - Reg. No. 4,303,644

STEP Touch®  - Reg. No. 4,713,774

Design Trademark  -  Reg. No. 4,149,627