Patented the 'Protograph' (US 1,874,749), a typewriter attachment producing an original plus up to four copies without carbon paper.
On August 30, 1932, Beulah Louise Henry patented U.S. Patent 1,874,749 for the Protograph, an ingenious attachment for typewriters that allowed a typist to produce an original document along with up to four copies simultaneously — without the need for messy, smudge-prone carbon paper.
At a time when offices relied heavily on carbon paper for duplicating correspondence, contracts, and records, the Protograph offered a cleaner, more efficient alternative. It exemplified Henry's talent for identifying friction points in everyday professional and domestic tasks and engineering elegant mechanical solutions, even in fields — like office equipment — dominated by male-run manufacturing firms.
The invention was well received and further cemented her reputation as a versatile inventor capable of moving fluidly between categories as different as parasols, toys, and business machines. The Protograph is specifically highlighted by the United States Patent and Trademark Office as an example of Henry's ingenuity in its historical profiles of her career. It stands as a testament to her broad inventive range: rather than specializing narrowly, she continually applied her visualization-based design process to whatever practical problem captured her attention, regardless of industry, further reinforcing her status as one of the most prolific and diverse women inventors of her generation.