Mr. Knapp was awarded 5 patents:
No. 15,660, September 2, 1856, Pen & Pencil Case
No. Des 861 (D000861) January 2, 1857, Pencil Case Design
No. 67,558, August 6, 1867, Pencil-Case
No. 123,485, February 6, 1872, Improvement in Pencil-Cases
No. 123,486, February 6, 1872, Improvement in Pencil-Cases
No. 142,243, August 26, 1873, Improvement in Pen and Pencil Cases
Knapp was in a copartnership with John Mabie in 1853 as Associated with Mabie, Knapp & Johnston at 15 John, New York, NY, and by 1854 as Mabie, Knapp, & McGovern at the same address.
Mr. Knapp was also a Gold Pen nib maker, having produced at least one Gold Pen nib which is curated in the Gold Pen nib makers page.