E21B 1/30

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2024/0384,597 DOWN-THE-HOLE HAMMER WITH PORTED PISTON AND FLOW CONTROL VALVEMay 16, 23Nov 21, 24Caterpillar Inc.
2024/0125,228 PERCUSSION DRILLING APPARATUS AND METHOD (WITH DAMPER)Feb 23, 22Apr 18, 24Rig Technologies International Pty Ltd
2024/0052,703 PERCUSSION DRILLING APPARATUS AND METHOD (WITH CHANNELS)Feb 23, 22Feb 15, 24Rig Technologies International Pty Ltd
2023/0151,694 FLUSHING AND CONNECTION ARRANGEMENTS FOR PERCUSSION DRILL TOOLSMar 25, 21May 18, 23MINCON INTERNATIONAL LIMITED
2008/0257,609 Pneumatically Reversible Ram Boring DeviceApr 10, 06Oct 23, 08TRACTO-TECHNIK GMBH & CO. KG
2007/0175,668 PROCESS AND SYSTEM FOR DRILLING AND LINING A BORE HOLEApr 10, 07Aug 02, 07HSBC BANK CANADA