IP Library Granted Patent US 4,759,064
Granted Patent Utility
US 4,759,064 · App. 06/784,999

Blind unanticipated signature systems

Inventor: David Chaum
Patented Case View Patent ↗
Granted: Jul 19, 1988 Filed: Oct 7, 1985
Inventor
David Chaum

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 4,759,064
App. No.
06/784,999
Filed
1985-10-07
Granted
1988-07-19
Kind
A