John D. Markham — 2 Patents at Electro Industries

John D. Markham has been granted 2 US patents while listed as an inventor at Electro Industries. The first was granted in 1984 and the most recent in November 1985. John D. Markham ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list John D. Markham in Droylsden, GB.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4551659	Trackside-controlled electric railway systems	—	1985-11-05
4450388	Dynamic braking of direct current motors	—	1984-05-22

John D. Markham — 2 Patents

Issued Patents All Time

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