John MacGregor — 4 Patents at Ann Arbor Machine

John MacGregor has been granted 4 US patents while listed as an inventor at Ann Arbor Machine. The first was granted in 1983 and the most recent in June 2011. John MacGregor ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list John MacGregor in Melbourne, OH, AU.

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
7964817	Electrical discharge machine apparatus for reverse taper bores	—	2011-06-21
7019247	Electrical discharge machine apparatus with piezo-electric head	—	2006-03-28
4846504	Secure on-pack promotional coupons	Frank J. Welch, Kenneth Lin	1989-07-11	$6,142,000
4398414	Electrical friction sleeve cone penetrometer	—	1983-08-16

John MacGregor — 4 Patents

Issued Patents All Time

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