Patent Assignment
Reel/Frame 004764/0527
Assignment of Assignors Interest.
Recorded: 1987-09-24
Pages: 3
Assignee
DEGUSSA AKTIENGESELLSCHAFT
WEISSFRAUENSTRASSE 9, 6000 FRANKFURT/MAIN, GERMANY
Covered Property
(1)
Process for the Removal of Alkali Metal Nitrite from Nitrate Containing Salt Bath
Patent:
4,717,429 →
Application:
06/893,513 →
Related Assignments
(3)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignor's Interest
Jun 20, 1995
From: DEGUSSA AKTIENGESELLSCHAFT
To: DURFERRIT GMBH THERMOTECHNIK
Reel/Frame 007505/0870 →
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
Nov 4, 1999
From: DURFERRIT GMBH THERMOTECHNIK
To: HOUGHTON DURFERRIT GMBH
Reel/Frame 010351/0748 →