NPK CONSTRUCTION EQUIPMENT, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6491114 Slow start control for a hydraulic hammerExpiredOct 03, 00Dec 10, 02[B23B]
6385870 Control system for an excavator thumb and a method of controlling an excavator thumbExpiredJul 06, 01May 14, 02[E02F]
5542180 Heavy duty shear with anti-jam featureExpiredFeb 03, 94Aug 06, 96[B23D]
5410905 Meter for comparing impact hammersExpiredAug 12, 93May 02, 95[G01L]
5408768 Impact hammer cylinderExpiredMar 18, 94Apr 25, 95[E02F, E21C]
5230151 Heavy duty shear head and mounting supportExpiredFeb 26, 92Jul 27, 93[B26B, B66C]
5220845 Vibratory compactor bearing lubricationExpiredApr 06, 92Jun 22, 93[F16H]
4906049 Ripper using a hydraulic hammer and a method for making the improvementExpiredNov 28, 88Mar 06, 90[E21C]

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