NATIONAL BROACH & MACHINE COMPANY,

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5326201 Loader/unloader for blind broachingExpiredJun 25, 93Jul 05, 94[B23D]
5257886 Coolant distribution system for blind broachingExpiredJan 19, 93Nov 02, 93[B23D]
5167603 Apparatus for progressive blind broachingExpiredJan 06, 92Dec 01, 92[B23Q]
4671709 Pot broachExpiredApr 24, 86Jun 09, 87[B23F]
4531868 Broaching machineExpiredJan 19, 82Jul 30, 85[B65G, B23D]
4518289 Pot broachExpiredJan 03, 84May 21, 85[B23F]
4488359 Automatic gear checking structure and methodExpiredJan 12, 83Dec 18, 84[G01B]
4477215 Broaching machine safetyExpiredNov 16, 81Oct 16, 84[B23D]
4449872 Broaching machineExpiredJun 01, 81May 22, 84[B23D]
4426893 High production serratorExpiredApr 28, 80Jan 24, 84[B21K]
4408473 Gear-rollerExpiredNov 09, 81Oct 11, 83[B23P, B21K, B21H, B21D]
4405270 Pot broach machine with turn-over loaderExpiredAug 17, 81Sep 20, 83[B23F, B23D]
4373933 Method of producing precision abrasive toolsExpiredMay 15, 81Feb 15, 83[C09C]
4274767 Helical toothed broachExpiredDec 10, 79Jun 23, 81[B26D]

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