IP Library › Granted Patent US 4,565,604
Granted Patent Utility
US 4,565,604 · App. 06/687,682

Retention and drainage aid

Inventors: P. E. Anders Hansson, Felek Jachimowicz
Patented Case View Patent ↗
Granted: Jan 21, 1986 Filed: Dec 31, 1984
Inventors
P. E. Anders Hansson
Felek Jachimowicz
Assignee (at issue)
W. R. Grace & Co.

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 4,565,604
App. No.
06/687,682
Filed
1984-12-31
Granted
1986-01-21
Kind
A