Pre-Tech Co., Ltd.

Also on record

Records under this name other than patents Pre-Tech Co., Ltd. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.

Showing 1 to 9 of 9 · Back to Pre-Tech Co., Ltd.

Patent	Title	Status	Expires	Confidence
US 8,221,032	Soil penetrating plate assembly to position geothermal conduit loops in soil Formerly held In force Term ends Feb 7, 2030 · From the USPTO record	In force	Term ends Feb 7, 2030	From the USPTO record
US 7,103,990	Rotation Type Silicon Wafer Cleaning Equipment Lapsed on the fee record Ended Sep 12, 2018 · High confidence	Lapsed on the fee record	Ended Sep 12, 2018	High confidence
US 6,050,276	Apparatus and method for cleaning a precision substrate Term ended Term ended Feb 12, 2018 · From the USPTO record	Term ended	Term ended Feb 12, 2018	From the USPTO record
US 5,186,192	Apparatus for cleaning silicon wafer Term ended Term ended no later than Feb 16, 2013 · Low confidence	Term ended	Term ended no later than Feb 16, 2013	Low confidence
US 5,725,753	Apparatus and method for cleaning semiconductor wafers Term ended Term ended no later than Mar 10, 2018 · Low confidence	Term ended	Term ended no later than Mar 10, 2018	Low confidence
US 5,733,434	Apparatus and method for cleaning semiconductor wafers Term ended Term ended no later than Mar 31, 2018 · Low confidence	Term ended	Term ended no later than Mar 31, 2018	Low confidence
US 5,927,305	Cleaning apparatus Term ended Term ended no later than Jul 27, 2019 · Low confidence	Term ended	Term ended no later than Jul 27, 2019	Low confidence
US 5,985,811	Cleaning solution and cleaning method Term ended Term ended no later than Nov 16, 2019 · Low confidence	Term ended	Term ended no later than Nov 16, 2019	Low confidence
US 6,003,527	Cleaning apparatus and a cleaning method Term ended Term ended no later than Dec 21, 2019 · Low confidence	Term ended	Term ended no later than Dec 21, 2019	Low confidence