IP Library › Granted Patent US 4,172,870
Granted Patent Utility
US 4,172,870 · App. 05/557,581

Method for permitting release of molded articles in the absence of a release agent other than a coating of zero grain soft water on the mold

Inventor: William E. Whitchurch
Patented Case View Patent ↗
Granted: Oct 30, 1979 Filed: Mar 12, 1975
Inventor
William E. Whitchurch
Assignee (at issue)
Millmaster Onyx Group, Inc.

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,172,870
App. No.
05/557,581
Filed
1975-03-12
Granted
1979-10-30
Kind
A