Patent Assignment
Reel/Frame 010351/0748
Assignment of Assignor's Interest
Recorded: 1999-11-04
Pages: 5
Assignor
DURFERRIT GMBH THERMOTECHNIK
Executed: 1999-09-22
Assignee
HOUGHTON DURFERRIT GMBH
INDUSTRIESTRASSE 3, D-68169 MANNHEIM, GERMANY
Covered Properties
(7)
Process for the Removal of Alkali Metal Nitrite from Nitrate Containing Salt Bath
Patent:
4,717,429 →
Application:
06/893,513 →
Process for Nitrocarburizing Components Made from Steel
Patent:
5,102,476 →
Application:
07/592,445 →
Method of Improving the Corrosion Resistance of Carbonitrided Components Made of Ferrous Materials
Patent:
5,288,340 →
Application:
07/746,427 →
Method for the Preparation of a Hardening Salt in Piece Form and Product
Patent:
5,453,109 →
Application:
08/274,428 →
Method for the Pre-Treatment of Steel Parts Prior to Salt Bath Nitriding
Patent:
5,735,971 →
Application:
08/563,547 →
Process for Recovering the Salt Constituents from Hardening-Shop Salt Baths
Patent:
5,769,906 →
Application:
08/721,658 →
Process for the Selective Recovery of the Salt Constituents from Used Hardening Shop Salts Which Contain Nitrite-Nitrate
Patent:
5,846,501 →
Application:
08/840,239 →
Related Assignments
(10)
Other recorded transfers of the patents in this record — the chain of ownership.
Assignment of Assignors Interest.
Sep 24, 1987
From: KUNST, HELMUT; SCONDO, CHRISTIAN
To: DEGUSSA AKTIENGESELLSCHAFT
Reel/Frame 004764/0527 →
Assignment of Assignors Interest.
Aug 16, 1991
From: CHRIST, ULRICH; KUNST, HELMUT; WAHL, GEORG
To: DEGUSSA AKTIENGESELLSCHAFT A GERMAN CORPORATION
Reel/Frame 005819/0828 →
Assignment of Assignors Interest.
Sep 10, 1991
From: WAHL, GEORG
To: DEGUSSA AKTIENGESELLSCHAFT
Reel/Frame 005828/0922 →
Assignment of Assignor's Interest
Jul 13, 1994
From: SCHALKE, PETER; MUELLER, EBERHARD; KREMER, MATTHIAS; WAHL, GEORG
To: DEGUSSA AKTIENGESELLSCHAFT
Reel/Frame 007111/0654 →
Assignment of Assignor's Interest
Jun 20, 1995
From: DEGUSSA AKTIENGESELLSCHAFT
To: DURFERRIT GMBH THERMOTECHNIK
Reel/Frame 007505/0870 →
Assignment of Assignor's Interest
Nov 28, 1995
From: WAHL, GEORG; WILLING-LEPENIES, RAINER
To: DURFERRIT GMBH THERMOTECHNIK
Reel/Frame 007799/0756 →
Assignment of Assignor's Interest
Dec 9, 1996
From: KREMER, MATTIAS; WAHL, GEORG; GOCK, EBERHARD; WIGGER, STEFAN
To: DURFERRIT GMBH THERMOTECHNIK
Reel/Frame 008416/0061 →
Assignment of Assignor's Interest
Oct 1, 1997
From: KREMER, MATTHIAS; WAHL, GEORG; WIGGER, STEFAN; GOCK, EBERHARD
To: DURFERRIT GMBH THERMOTECHNIK
Reel/Frame 008752/0228 →
Assignment of Assignor's Interest
May 20, 1999
From: DUFERRIT GMBH THERMOTECHNIK
To: HOUGHTON DURFERRIT GMBH
Reel/Frame 009958/0510 →
Assignment of Assignor's Interest
Apr 18, 2000
From: DEGUSSA AKTIENGESELLSCHAFT
To: DEGUSSA-HULS AKTIENGESELLSCHAFT
Reel/Frame 010719/0914 →