David A. Spence — 6 Patents at Berol

David A. Spence has been granted 6 US patents while listed as an inventor at Berol. The first was granted in 1983 and the most recent in October 2019. David A. Spence ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list David A. Spence in Hartland, WI, US.

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #	Title	Co-Inventors	Date
10433525	Illuminated dog belt	—	2019-10-08
9938669	Roadworthy rail ballast regulator	James W. Boyd, Justin J. Pipol, Michael Thompson	2018-04-10
8675331	Electronic gaming machine interface system	—	2014-03-18
8107240	Electronic gaming machine interface system	—	2012-01-31
5297921	Releasable locking device	Scott L. Springer	1994-03-29
D268597	Drawing template	—	1983-04-12

David A. Spence — 6 Patents

Issued Patents All Time

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