Granted Patent
Utility
US 4,504,402 · App. 06/609,665
Encapsulated phase change thermal energy _storage materials
Inventors:
Johnson Chen, John L. Eichelberger
Patented Case
View Patent ↗
Granted: Mar 12, 1985
Filed: May 14, 1984
Inventors
Johnson Chen
John L. Eichelberger
Assignee (at issue)
Pennwalt Corporation
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.