DP

David R. Polak

OE Otis Elevator: 6 patents #262 of 1,840Top 15%
Hamilton Sundstrand: 1 patents #1,184 of 2,079Top 60%
Overall (All Time): #703,560 of 4,157,543Top 20%
7
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
11643301 System and method for monitoring sheave bearing condition Yan Chen, Paul R. Braunwart, Zaffir A. Chaudhry, Charles C. Coffin 2023-05-09
10773929 Sheave for elevator system Jun Ma, Peter Keyo, Brad Guilani, Gopal R. Krishnan, David J. Lanesey +2 more 2020-09-15
10336581 System and method for reducing belt noise Christopher T. Chipman, Charles C. Coffin, Arthur Blanc, John P. Wesson, Yan Chen +2 more 2019-07-02
10246300 Elevator virtual aerodynamic shroud Ray-Sing Lin, David E. Parekh, Mark S. Thompson 2019-04-02
9815667 Coated sheave Xiaomei Yu, Yan Chen, Daniel V. Viens, John P. Wesson 2017-11-14
9630806 Sheave for an elevator system John P. Wesson, Xiaomei Yu 2017-04-25
8167540 System for reducing compressor noise Robert Hans Schlinker, James C. Napier, Ray-Sing Lin, Scott A. Liljenberg, Anthony C. Jones 2012-05-01