Patent Assignment
Reel/Frame 003923/0944
Assignment of Assignors Interest.
Recorded: 1981-09-17
Pages: 1
Assignee
KOPPERS COMPANY, INC., A CORP. OF DE.
KOPPERS BLDG., PITTSBURGH, PENNSYLVANIA, 15219
Covered Property
(1)
Preparation of Naphthalene-Oxidation Catalyst by Impregnation of Silica with Aqueous Solution of VOC2O4 -K2SO4 -KHSO4
Patent:
4,389,336 →
Application:
06/303,169 →
Related Assignments
(4)
Other recorded transfers of the patent in this record — the chain of ownership.
Assignment of Assignors Interest.
Feb 16, 1989
From: KOPPERS COMPANY, INC.
To: KOPPERS INDUSTRIES, INC., A CORP. OF PA
Reel/Frame 005126/0140 →
Security Interest
Feb 27, 1989
From: KOPPERS INDUSTRIES, INC.
To: KOPPERS AND MELLON BANK, N.A.
Reel/Frame 005026/0517 →
License
May 24, 1989
From: KOPPERS INDUSTRIES
To: HARJU, PHILIP H.
Reel/Frame 005077/0878 →
Assignment of Assignor's Interest
Feb 17, 1994
From: MELLON BANK, N.A.
To: KOPPERS INDUSTRIES, INC.
Reel/Frame 006875/0231 →