Application

19288930 · PERMEABILITY ENHANCEMENT DEVICE FOR COAL-SEAM GAS DRAINAGE

Filed 2025-08-01 · Granted · Patent 12669055 (2026-06-30) The official file ↗The patent and its PDF ↗ · Art unit 3678 · Examiner Sunil Singh Typical · CPC E21F 7/00 · Henan Polytechnic University · QQW-2

Office actions

first was Non-final rejection

RCEs

no appeal

To first action

8.0 mo

to disposition 10.9 mo

Statutes raised

0 actions read

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