Berchem & Schaberg GmbH

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4910093 Piston blank for a forged pistonExpiredMar 30, 89Mar 20, 90[B21K, F02F]
4769886 Concrete reinforcing element and method of making a concrete reinforcementExpiredDec 10, 84Sep 13, 88[B23P]
4744158 Excavator tooth assembly for earth moving equipmentExpiredOct 29, 86May 17, 88[E02F]
4716643 Method of making a machine part for abrasive applicationsExpiredApr 30, 86Jan 05, 88[B23P]
4712321 Excavator tooth for earth moving equipmentExpiredOct 29, 86Dec 15, 87[E02F]
4711503 Replaceable tooth for a digging and breaking toolExpiredAug 27, 86Dec 08, 87[A01B, E21C, E02F]
4711504 Rotating cutter headExpiredAug 27, 86Dec 08, 87[E21C]
4676014 Excavator toothExpiredJan 24, 86Jun 30, 87[E02F]
4662047 Method of making a one-piece piston for an internal-combustion engineExpiredJan 24, 86May 05, 87[B23P, B21D]
4644776 Method of making a low-alloy forgingExpiredDec 11, 85Feb 24, 87[B21J]
4634062 Forged steel grinding element for ball millingExpiredNov 01, 84Jan 06, 87[B02C]
4591089 Method of making a composite forged-metal articleExpiredSep 17, 84May 27, 86[B23K]
4561908 Method of making forged steel articles, especially for vehicle partsExpiredMar 02, 83Dec 31, 85[C21D]
4550757 Traction chain for a driven wheel of a wheeled vehicleExpiredOct 20, 83Nov 05, 85[B60C]
4532686 Method of making a piston bottomExpiredJun 10, 83Aug 06, 85[B23P]
4527987 Sprocket wheel and method of making sameExpiredNov 30, 83Jul 09, 85[F16H]
4510706 Cutting-tooth anchor for suction dredge and method of making sameExpiredJan 06, 84Apr 16, 85[E02F]
4488608 Rotary stone-cutting head with hardened teeth insertsExpiredAug 31, 82Dec 18, 84[E21B]
4461513 Rotary stone-cutting headExpiredJun 18, 82Jul 24, 84[E21C]

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