| 5880414 |
Elevator door brake, brake, lock, and hold-open |
Thomas M. Kowalczyk, Frank Guliuzza, Jr., Edward E. Ahigian, Richard E. Kulak, Thomas M. McHugh +3 more |
1999-03-09 |
$22,278,000 |
| 5808246 |
Triac drive for three-phase line-powered linear induction motor elevator door operator |
Richard E. Peruggi, Thomas M. McHugh, Edward E. Ahigian, Thomas He, Thomas M. Kowalczyk +3 more |
1998-09-15 |
$6,891,000 |
| 5736693 |
Elevator door drive using dual secondary linear induction motor |
Zbigniew Piech, Thomas M. Kowalczyk, Edward E. Ahigian, Richard E. Kulak, Thomas M. McHugh +3 more |
1998-04-07 |
$14,131,000 |
| 5732796 |
Elevator car evacuation deterrent device |
Edward E. Ahigian, David W. Barrett, Thomas M. McHugh, 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, Thomas He, Thomas M. Kowalczyk +2 more |
1997-10-28 |
$11,835,000 |
| 5669465 |
Elevator hoistway door bolt lock |
Richard E. Kulak, Thomas M. McHugh, Edward E. Ahigian, Thomas He, Richard E. Peruggi +2 more |
1997-09-23 |
$16,948,000 |
| 5668355 |
Elevator cab door drive system |
Thomas M. Kowalczyk, Edward E. Ahigian, Thomas M. McHugh, Thomas He, Richard E. Peruggi +2 more |
1997-09-16 |
$18,140,000 |
| 5651427 |
Elevator door coupling and hold-close apparatus |
Richard E. Kulak, Edward E. Ahigian, Thomas M. McHugh, Thomas He, Richard E. Peruggi +2 more |
1997-07-29 |
$12,363,000 |
| 5651428 |
Stationary actuator moving vane elevator car door coupling |
Edward E. Ahigian, David W. Barrett, Thomas M. McHugh, Thomas He, Richard E. Peruggi +2 more |
1997-07-29 |
$12,363,000 |
| 5612518 |
Linear induction motor door drive assembly for elevators |
Zbigniew Piech, Frank Guliuzza, Jr., Thomas M. McHugh, Edward E. Ahigian, Thomas He +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, David W. Barrett, Edward E. Ahigian, 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, Thomas He, Thomas M. Kowalczyk +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, Thomas He, Thomas M. Kowalczyk +2 more |
1996-03-05 |
$8,675,000 |
| 5494137 |
Elevator door mounting system |
Thomas M. Kowalczyk, Thomas M. McHugh, Edward E. Ahigian, Thomas He, Richard E. Peruggi +2 more |
1996-02-27 |
$26,823,000 |
| 5487449 |
Magnetic elevator door coupling |
David W. Barrett, Thomas M. McHugh, Edward E. Ahigian, 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, Thomas He, Richard E. Peruggi +2 more |
1996-01-23 |
$5,072,000 |
| 5454447 |
Elevator hoistway door bolt lock |
Richard E. Kulak, Thomas M. McHugh, Edward E. Ahigian, Thomas He, Richard E. Peruggi +2 more |
1995-10-03 |
$6,134,000 |
| 5435415 |
Cammed wedge elevator car door coupling |
Richard E. Kulak, Edward E. Ahigian, Thomas M. McHugh, Thomas He, Richard E. Peruggi +2 more |
1995-07-25 |
$5,410,000 |
| 5259492 |
Dual belt linear handrail drive |
— |
1993-11-09 |
$6,859,000 |
| 5235145 |
Elevator with linear motor drive assembly |
Eric G. Olsen, Ernest P. Gagnon |
1993-08-10 |
$6,175,000 |
| 5235226 |
Highly conductive layer arrangement for a linear motor secondary |
Eric G. Olsen, Ernest P. Gagnon |
1993-08-10 |
$6,175,000 |
| 5086881 |
Elevator driven by a flat linear motor |
Ernest P. Gagnon, Eric G. Olsen |
1992-02-11 |
$6,385,000 |