Inventor · disambiguated record
John D. Markham
Also filed as: MARKHAM JOHN D · MARKHAM JOHN DAVID
3 granted patents·37 citations·filing 1977–1983
70Inventor score
Top patents by PatentIndex Score
3 records- 0163US4092577ADynamic braking of direct current motorsASS ELECT IND·Filed 1977·Granted May 30, 1978·19 cites·9 claims
- 0250US4450388ADynamic braking of direct current motorsASS ELECT IND·Filed 1982·Granted May 22, 1984·12 cites·8 claims
- 0328US4551659ATrackside-controlled electric railway systemsMARKHAM JOHN D·Filed 1983·Granted Nov 5, 1985·6 cites·11 claims
Join the waitlist — get patent alerts
Get an alert when John D. Markham files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →