Many family-run roasteries attach a proud sense of heritage and tradition to their brand, but it is rare that a family can lay claim to an invention that went on to change the coffee roasting world.   Following in the footsteps of his father, Lutz Reinhart-van Gülpen is now the sixth generation to keep the flame burning when he took over the reign of his family-run business eight years-ago. The father-of-four and current business manager of Van Gülpen Kaffeerösterei, established  in 1832, explains his connections to roasting royalty: “We had two founders, Carl Lambert van Gülpen and J.H. Lensing, who imported green coffee from Holland which was transported down the Rhine…