Patent search

R. Duncan MacKenzie

New Member
Mar 11, 2020
DeLand, FL 32724
Kliegl: US1,679,361 US1,740,463 US1.742,600 US1,742,601 US1.991.615 US2,853,599
Century: US2,114,963 Strong: US1,885,642 McCandless: US2,668,904
Mole-Richardson: US1,892,538 US2,057,278 Brenkert: US1.515.724 US1,591,724 US1,595,753
A good search class on USPTO is: cpc/F21S10/00
I trust this will give you some of the basic spotlight patents you are seeking