DH

Donald R. Hughes

GT Greenleaf Technology: 8 patents #1 of 6Top 20%
CG Chrysler Group: 1 patents #1,051 of 2,641Top 40%
S( Standard Oil Company (Indiana): 1 patents #254 of 576Top 45%
📍 Meadville, PA: #6 of 150 inventorsTop 4%
🗺 Pennsylvania: #3,636 of 74,527 inventorsTop 5%
Overall (All Time): #238,114 of 4,157,543Top 6%
19
Patents All Time

Issued Patents All Time

Showing 1–19 of 19 patents

Patent #TitleCo-InventorsDate
10352001 Rail re-profiling method and apparatus Charles D. Grabowski 2019-07-16
9834891 Rail re-profiling method and apparatus Charles D. Grabowski 2017-12-05
9827621 Cutting tool including a cutting insert retaining and adjusting mechanism 2017-11-28
9617691 Rail re-profiling method and apparatus Charles D. Grabowski 2017-04-11
9073131 Slotting cutter and inserts for same 2015-07-07
8267625 Slotting cutter and inserts for same 2012-09-18
8177459 Ball nose end mill and insert Travis J. Biggs 2012-05-15
8095287 Methods and systems for controlling an axle disconnect device for an all-wheel drive vehicle Brian E. Beechie, Daniel Brown, Charles Bienenstein, James C Savage, Mark C. Azzaretti +1 more 2012-01-10
6712564 Tool with improved resistance to displacement James M. Greenleaf, Stanley B. Howles 2004-03-30
6173595 Lock picking apparatus 2001-01-16
6138486 Lock picking apparatus 2000-10-31
6041629 Lock picking apparatus 2000-03-28
5956984 Lock picking apparatus 1999-09-28
4831852 Key operated lock 1989-05-23
4683739 Key operated lock 1987-08-04
D290581 Tubular key 1987-06-30
4622834 Key assembly 1986-11-18
4324513 Tubular key manufacturing machine 1982-04-13
4217571 Stutter seismic source William H. Gumma, Neil S. Zimmerman 1980-08-12