Patents By Year – 1921 To 1930 1921 No. 1,393,991 - Plane (John M. Dodenhof) (1921)No. 1,399,631 - Plane-Scraper (Charles J. Lofdahl And Carl A. Lofdahl) (1921) 1922 No. 1,412,609 - Gauge For Carpenter's Planes And The Like (George Eger) (1922) 1923 1924 1925 1926 1927 1928 1929 1930