Inventor · disambiguated record
David Krofchak
Also filed as: KROFCHAK DAVID
17 granted patents·3 pending applications·280 citations·filing 1974–2006
95Inventor score
Files withFENICEM MINERALS INC6KROFCHAK DAVID5ATEBA MINES INC2CLAYTECH ENVIROMENTAL SERVICES1INT SOLIDIFICATION INC1
Top patents by PatentIndex Score
20 records- 0186US6440194B1Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slagFENICEM MINERALS INC·Filed 2000·Granted Aug 27, 2002·25 cites·2 claims
- 0286US4229295ASolidification of aqueous sludgeKROFCHAK DAVID·Filed 1979·Granted Oct 21, 1980·48 cites·9 claims
- 0378US5593493AMethod of making concrete from base metal smelter slagFiled 1995·Granted Jan 14, 1997·27 cites·2 claims
- 0471US5439505ATreatment of steel mill waste for recyclingFiled 1994·Granted Aug 8, 1995·27 cites·10 claims
- 0570US5749962AMethod of making cement from base metal smelter slagFENICEM MINERALS INC·Filed 1996·Granted May 12, 1998·18 cites·4 claims
- 0669US6033467AMethod of making cement or mine backfill from base metal smelter slagFENICEM MINERALS INC·Filed 1998·Granted Mar 7, 2000·24 cites·7 claims
- 0765US4216012AProcess for the treatment of incinerated sewage sludge ashKROFCHAK DAVID·Filed 1979·Granted Aug 5, 1980·16 cites·16 claims
- 0861US4110212AMethod of treating a waste liquid containing polluting compoundsKROFCHAK DAVID·Filed 1977·Granted Aug 29, 1978·17 cites·8 claims
- 0959US4279635AProcess for treating phosphatic clay suspensionsKROFCHAK DAVID·Filed 1979·Granted Jul 21, 1981·8 cites·13 claims
- 1058US5865872AMethod of recovering metals and producing a secondary slag from base metal smelter slagFENICEM MINERALS INC·Filed 1997·Granted Feb 2, 1999·19 cites·11 claims
- 1155US3965243ARecovery of sodium thiocyanateKROFCHAK LTD DAVID·Filed 1974·Granted Jun 22, 1976·7 cites·5 claims
- 1252US5626646AMethod of recovering metals and producing a secondary slag from base metal smelter slagFENICEM MINERALS INC·Filed 1996·Granted May 6, 1997·8 cites·6 claims
- 1351US6231767B1Treatment of phosphatic wastesCLAYTECH ENVIROMENTAL SERVICES·Filed 1999·Granted May 15, 2001·13 cites·6 claims
- 1445US2007209476A1Treatment of base metal smelter slagKROFCHAK DAVID·Filed 2006·Application pending·0 cites
- 1543US5968258AMethod of making cement from base metal smelter slagFENICEM MINERALS INC·Filed 1998·Granted Oct 19, 1999·8 cites·2 claims
- 1638US6026965AProcess for recovering mineral particles, metal particles or small precious stones from an aqueous slim associated with an ore body or mineral deposit or processing thereofATEBA MINES INC·Filed 1999·Granted Feb 22, 2000·5 cites·11 claims
- 1737US5573576AMethod of treating steel mill wasteINT SOLIDIFICATION INC·Filed 1995·Granted Nov 12, 1996·7 cites·15 claims
- 1837US2002170849A1Manufacture of sodium tripolyphosphateFiled 2001·Application pending·0 cites
- 1935US2002033120A1Method of making cement from tailings or rock fines containing silicate or siliceous compoundsFiled 2001·Application pending·0 cites
- 2029US5893463ARecovering precious metals and small precious stones from clay suspensionsATEBA MINES INC·Filed 1997·Granted Apr 13, 1999·3 cites·12 claims
Join the waitlist — get patent alerts
Get an alert when David Krofchak files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →