Vertical differential coil technique is also described in Kinman's US Patents 5,668,520 and 6,103,966 with priority date of March 1996. This was absolutely novel in 1996 and without the presence of iron to boost the efficiency of the noise sensing coil differential coil technology would not have been possible. One of the most important elements of Kinman's patents is the use of iron in the core of the noise sensing coil. Kinman at first concentrated on particularly the Fender type single coil pickup and in 2009 the P-90 pickup. Kinman Guitar Electrix were awarded 5 or more US patents beginning circa 1996 for innovative design concerned with hum canceling single pole pickups.
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