IP Library › Granted Patent US 4,638,726
Granted Patent Utility
US 4,638,726 · App. 06/721,911

Load bearing swab cup

Inventors: Phil Johnson, Robert K. Brock
Patented Case View Patent ↗
Granted: Jan 27, 1987 Filed: Apr 10, 1985
Inventors
Phil Johnson
Robert K. Brock
Assignee (at issue)
LTV Energy Products 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 4,638,726
App. No.
06/721,911
Filed
1985-04-10
Granted
1987-01-27
Kind
A