google cache of mimivanderhave.com
1945 The first double-pane, insulated window was introduced
That's without attribution; door and window claims
From single to double pane windows… The true evolution of double pane
windows originated in 1913 when the Andersen Lumber Co. became the
first to manufacture wood window frames. In 1932 they added the sash
and hardware, and two years later, even the glazing. Making the entire
factory-squared, tight-fitting assembly was the first step in laying
the groundwork for what would become today's double pane windows for
the home. In 1952, they introduced a Welded Insulated Glass window,
and the double pane window was born.
An interesting note over at ecobuildingpulse says:
Robert Struble, communications manager at PPG Industries (formerly
Pittsburgh Plate Glass), says that the concept of double glazing
originated in the 1860s. An inventor filed a claim with the U.S.
Patent and Trademark Office for an insulating glass product consisting
of two glass panes separated by rope and bound with tar. “Of course,
nothing happened with [that product],” Struble says. “Nobody used it,
and it was not necessarily commercially viable.
1940s and '50s: Double and Triple Glazing
The east- and west facings of the United Nations' headquarters in New
York, completed in 1953, are clad in insulated glazing. Muhammad
Ghouri/Flickr The east- and west facings of the United Nations'
headquarters in New York, completed in 1953, are clad in insulated
glazing. In 1945, PPG developed one of the first commercially viable
double-glazed IGUs in the U.S. Though they were originally used for
Pullman railroad cars, the units found their way into buildings the
following year, reducing U-factors from the 1-plus values of
single-glazed units to 0.47.