Granted Patent
Utility
US 6,219,977 · App. 09/305,614
Tubular skylight with round-to-square adaptor
Inventors:
Bing-Ling Chao, Christian P. Stevens, Joseph Prenn
Patented Case
View Patent ↗
Granted: Apr 24, 2001
Filed: May 5, 1999
Inventors
Bing-Ling Chao
Christian P. Stevens
Joseph Prenn
Assignee (at issue)
Solatube International, 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.