IP Library › Granted Patent US 4,849,255
Granted Patent Utility
US 4,849,255 · App. 07/072,921

Electric resistance heater

Inventors: Frederick G. J. Grise, John A. Martstiller, Paul H. Bodensiek
Patented Case View Patent ↗
Granted: Jul 18, 1989 Filed: Jul 14, 1987
Inventors
Frederick G. J. Grise
John A. Martstiller
Paul H. Bodensiek

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 4,849,255
App. No.
07/072,921
Filed
1987-07-14
Granted
1989-07-18
Kind
A