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USPTO Patent Rankings Data through Dec 31, 2025
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David W. Barrett — 27 Patents

OEOtis Elevator: 22 patents #55 of 1,840Top 3%
Rolls-Royce Plc: 4 patents #614 of 2,886Top 25%
Hartland, CT: #1 of 19 inventorsTop 6%
Connecticut: #1,328 of 34,797 inventorsTop 4%
Overall (All Time): #142,059 of 4,157,543Top 4%
27 Patents All Time
David W. Barrett has been granted 27 US patents while listed as an inventor at Otis Elevator. The first was granted in 1994 and the most recent in October 2012. David W. Barrett ranks #142,059 of 4,157,543 US inventors in our database (top 3.4%). Patent records list David W. Barrett in Hartland, CT, US.

Issued Patents All Time

Showing 1–25 of 27 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
8297925 Aerofoil configuration 2012-10-30
6874987 Cooled turbine blade John Slinger, Christopher Michael Robson 2005-04-05
6641363 Gas turbine structure Philip D Robinson 2003-11-04
6616407 Gas turbine engine guide vane 2003-09-09
5880414 Elevator door brake, brake, lock, and hold-open Jerome F. Jaminet, Thomas M. Kowalczyk, Frank Guliuzza, Jr., Edward E. Ahigian, Richard E. Kulak +3 more 1999-03-09 $22,278,000
5857545 Elevator system with overlapped roped-coupler segments John F. Cassidy, Jr., George A. L. David, Ernest P. Gagnon, Richard E. Peruggi 1999-01-12 $28,592,000
5816368 Elevator cars switch hoistways while traveling vertically John F. Cassidy, Jr., George A. L. David, Ernest P. Gagnon, Andrew F. Peruggi, Richard E. Peruggi 1998-10-06 $12,422,000
5808246 Triac drive for three-phase line-powered linear induction motor elevator door operator Richard E. Peruggi, Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +3 more 1998-09-15 $6,891,000
5736693 Elevator door drive using dual secondary linear induction motor Zbigniew Piech, Jerome F. Jaminet, Thomas M. Kowalczyk, Edward E. Ahigian, Richard E. Kulak +3 more 1998-04-07 $14,131,000
5732796 Elevator car evacuation deterrent device Edward E. Ahigian, Thomas M. McHugh, Jerome F. Jaminet, Thomas He, Richard E. Peruggi +2 more 1998-03-31 $17,285,000
5682023 Time-optimal control of an AC line-driven linear motor elevator door operator Thomas M. McHugh, Richard E. Peruggi, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +2 more 1997-10-28 $11,835,000
5669465 Elevator hoistway door bolt lock Richard E. Kulak, Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +2 more 1997-09-23 $16,948,000
5668355 Elevator cab door drive system Jerome F. Jaminet, Thomas M. Kowalczyk, Edward E. Ahigian, Thomas M. McHugh, Thomas He +2 more 1997-09-16 $18,140,000
5651428 Stationary actuator moving vane elevator car door coupling Edward E. Ahigian, Thomas M. McHugh, Jerome F. Jaminet, Thomas He, Richard E. Peruggi +2 more 1997-07-29 $12,363,000
5651427 Elevator door coupling and hold-close apparatus Richard E. Kulak, Edward E. Ahigian, Thomas M. McHugh, Jerome F. Jaminet, Thomas He +2 more 1997-07-29 $12,363,000
5612518 Linear induction motor door drive assembly for elevators Jerome F. Jaminet, Zbigniew Piech, Frank Guliuzza, Jr., Thomas M. McHugh, Edward E. Ahigian +4 more 1997-03-18 $12,269,000
5538106 Rotationally stiff elevator car door coupling Thomas M. McHugh, Thomas M. Kowalczyk, Richard E. Kulak, Thomas He, Edward E. Ahigian +2 more 1996-07-23 $11,833,000
5509504 Velocity regulated, open current loop, variable voltage, variable frequency, linear induction motor drive for an elevator car door Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He, Richard E. Peruggi +2 more 1996-04-23 $8,851,000
5503248 Maintaining open loop current drive to linear induction motor Richard E. Peruggi, Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +2 more 1996-04-02 $11,979,000
5495918 Smooth and quiet linear induction motor elevator door operation Richard E. Peruggi, Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +2 more 1996-03-05 $8,675,000
5494137 Elevator door mounting system Thomas M. Kowalczyk, Jerome F. Jaminet, Thomas M. McHugh, Edward E. Ahigian, Thomas He +2 more 1996-02-27 $26,823,000
5487449 Magnetic elevator door coupling Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He, Richard E. Peruggi +2 more 1996-01-30 $11,690,000
5485896 Rotary elevator car door coupling Thomas M. Kowalczyk, Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +2 more 1996-01-23 $5,072,000
5454447 Elevator hoistway door bolt lock Richard E. Kulak, Thomas M. McHugh, Edward E. Ahigian, Jerome F. Jaminet, Thomas He +2 more 1995-10-03 $6,134,000
5435415 Cammed wedge elevator car door coupling Richard E. Kulak, Edward E. Ahigian, Thomas M. McHugh, Jerome F. Jaminet, Thomas He +2 more 1995-07-25 $5,410,000