IP Library › Granted Patent US 4,752,341
Granted Patent Utility
US 4,752,341 · App. 07/056,035

Pigment system for paper

Inventor: Steven L. Rock
Patented Case View Patent ↗
Granted: Jun 21, 1988 Filed: Jun 1, 1987
Inventor
Steven L. Rock
Assignee (at issue)
PQ Corporation

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

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Quick Facts
Patent No.
US 4,752,341
App. No.
07/056,035
Filed
1987-06-01
Granted
1988-06-21
Kind
A