IP Library › Granted Patent US 4,792,688
Granted Patent Utility
US 4,792,688 · App. 07/062,038

Differentially pumped seal apparatus

Inventor: Lydia J. Young
Patented Case View Patent ↗
Granted: Dec 20, 1988 Filed: Jun 15, 1987
Inventor
Lydia J. Young
Assignee (at issue)
PerkinElmer, 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 4,792,688
App. No.
07/062,038
Filed
1987-06-15
Granted
1988-12-20
Kind
A