Last Updated: Aug 24, 2018 Views: 68
Hello! Thank you for your question!
According to the Survey of Technical Progress, Corning Glass Works, Part 29: Listing and Index of Patents Issued 1877 to 1925 (Corning, N.Y.: The company, 1965), Corning Glass Works' earliest patent filed was for a semaphore lens. It is held by C.F. Houghton and dated February 20, 1877 (Patent #187,631, or US000187631).
The lens was designed to be resistant to breakage caused by the heat from lamp flames.
Please do not hesitate to ask us your glass-related questions in the future.
The Corning Museum of Glass is currently closed to the public effective March 16 through April 22, 2020, as a precautionary measure for public health and safety. As a result, resources available to answer your questions are extremely limited. During this closure, you may be interested in searching our Ask a Glass Question FAQs or reviewing our Research Guides on various topics. We also highly recommend checking out The Corning Museum of Glass on YouTube for hours of artist demonstrations, lectures, and special events. Thank you for your patience.