Barber-Greene Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5054931 Counterflow asphalt drum mixer producing less hydrocarbon emissions and a method used thereinExpiredApr 06, 87Oct 08, 91[B01F, E01C]
4839571 Safety back-up for metering pump controlExpiredMar 17, 87Jun 13, 89[G05B]
4666092 Torque limiter for gyratory crusher anti-spin clutchExpiredDec 26, 85May 19, 87[B02C]
4615491 Gyratory crusher with automatic tramp iron releaseExpiredApr 14, 81Oct 07, 86[B02C]
4441821 Apparatus for increasing the delivery range of a mixing and delivery auger troughExpiredJul 20, 82Apr 10, 84[B28C]
4342485 Cold surface planer cooling apparatusExpiredAug 29, 80Aug 03, 82[E01C]
4337014 Method and apparatus for erecting a portable silo and elevatorExpiredNov 28, 80Jun 29, 82[E04H]
4332478 Method and apparatus for reducing smoke emissions in an asphalt drum mixerExpiredMay 16, 79Jun 01, 82[B28C]
4309168 System for combining multiple fuels to produce controllable gas temperatures in asphalt drum mixersExpiredJul 14, 80Jan 05, 82[F27B, F27D]
4198003 Quick release for gyratory crusher concaveExpiredMar 19, 79Apr 15, 80[B02C]

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