Granted Patent
Utility
US 6,744,978 · App. 09/908,863
Small diameter low watt density immersion heating element
Inventors:
Clifford D. Tweedy, Theodore VonArx
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: Jul 19, 2001
Inventors
Clifford D. Tweedy
Theodore VonArx
Assignee (at issue)
Watlow Polymer Technologies
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.