Ricerca semantica
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- Year 1930, n° US-1882780, applied in 1932, by Arthur O. Dahlberg. Fountain pen.
- Year 1930, n° US-1892145, applied in 1932, by Walter E. Guyot. Mechanical pencil.
- Year 1932, n° US-1892181, applied in 1932, by Ivan D. Tefft. Desk set structure.
- Year 1933, n° US-1904358, applied in 1933, by Arthur O. Dahlberg. Fountain pen.
- Year 1931, n° US-1916808, applied in 1932, by Kenneth S. Parker. Desk set.
- Year 1929, n° US-1917568, applied in 1933, by Benjamin F. Wupper. Fountain pen.
- Year 1931, n° US-1920770, applied in 1933, by Ivan D. Tefft, Kenneth S. Parker. Mechanical pencil.
- Year 1931, n° US-1932248, applied in 1933, by Carl S. Miner, Galen H. Sayler. Permanent quick drying writing fluid.
- Year 1932, n° US-1950364, applied in 1934, by William E. Moore. Fountain pen feed.
- Year 1931, n° US-1956084, applied in 1934, by Ivan D. Tefft. Desk set mounting.
- Year 1931, n° US-1972395, applied in 1934, by Galen H. Sayler. Permanent brilliantly colored writing fluid.
- Year 1932, n° US-1980508, applied in 1934, by Ivan D. Tefft. Fountain pen filling device.
- Year 1934, n° US-1985643, applied in 1934, by Carl Pfanstiehl. Fountain pen.
- Year 1934, n° US-1989351, applied in 1935, by Lucius A. Crowell. Fountain pen and other marking means.
- Year 1932, n° US-2016106, applied in 1935, by Arthur O. Dahlberg. Fountain pen.
- Year 1934, n° US-2031343, applied in 1936, by Ivan D. Tefft. Fountain pen.
- Year 1934, n° US-2035372, applied in 1936, by David F. Mohns. Fountain pen.
- Year 1934, n° US-2035378, applied in 1936, by Galen H. Sayler. Fountain pen.
- Year 1934, n° US-2037177, applied in 1936, by Nathan W. Paquette. Fountain pen.
- Year 1936, n° US-2096044, applied in 1937, by Roy B. Johns. Tube and method of forming the same.
- Year 1936, n° US-2110007, applied in 1938, by Ivan D. Tefft. Desk set.
- Year 1937, n° US-2187528, applied in 1940, by Russel T. Wing. Fountain pen.
- Year 1939, n° US-2223541, applied in 1940, by Marlin S. Baker. Fountain pen.
- Year 1940, n° US-2254975, applied in 1941, by Milton R. Pickus. Material for pen tips.
- Year 1939, n° US-2267147, applied in 1941, by Marlin S. Baker. Process for manufacturing pen nibs.
- Year 1940, n° US-2278907, applied in 1942, by Marlin S. Baker. Fountain pen.
- Year 1941, n° US-2282840, applied in 1942, by Russell T. Wing. Fountain pen.
- Year 1941, n° US-2286878, applied in 1942, by Ivan D. Tefft, Marlin S. Baker. Adjustable eraser holder.
- Year 1941, n° US-2308658, applied in 1943, by Otto Jendresen. Apparatus for tipping metal bases with metal tips.
- Year 1941, n° US-2308659, applied in 1943, by Otto Jendresen. Apparatus for tipping metal bases with metal tips.
- Year 1942, n° US-2308810, applied in 1943, by Philip C. Hull. Desk set mounting.
- Year 1941, n° US-2328580, applied in 1943, by Milton R. Pickus. Ruthenium alloy pen point.
- Year 1941, n° US-2339079, applied in 1944, by Otto Jendresen. Apparatus for tipping metal bases with metal tips.
- Year 1942, n° US-2343991, applied in 1944, by David F. Mohns. Filling mechanism for fountain pens.
- Year 1944, n° US-2360297, applied in 1944, by Russell T. Wing. Fountain pen.
- Year 1943, n° US-2375770, applied in 1945, by Arthur O. Dahlberg. Fountain pen.
- Year 1943, n° US-2386500, applied in 1945, by Kenneth S. Parker. Desk set.
- Year 1944, n° US-2387001, applied in 1945, by Marlin S. Baker. Fountain pen.
- Year 1944, n° US-2392942, applied in 1946, by Lester W. Ormsby. Fountain pen cap construction.
- Year 1944, n° US-2398531, applied in 1946, by Philip C. Hull. Filling mechanism for fountain pens.
- Year 1944, n° US-2400768, applied in 1946, by David F. Mohns. Fountain pen.
- Year 1944, n° US-2403039, applied in 1946, by Marlin S. Baker. Fountain pen.
- Year 1944, n° US-2403083, applied in 1946, by Philip C. Hull. Desk set mounting.
- Year 1944, n° US-2404063, applied in 1946, by Emmett Healy. Fountain pen.
- Year 1944, n° US-2406330, applied in 1946, by Walter J. Heagney. Fountain pen filling unit.
- Year 1945, n° US-2417861, applied in 1947, by Arthur O. Dahlberg. Fountain pen.
- Year 1945, n° US-2427068, applied in 1947, by Robert W. Randolph. Ball-point writing instrument.
- Year 1945, n° US-2427069, applied in 1947, by Robert W. Randolph. Writing instrument.
- Year 1945, n° US-2428854, applied in 1947, by Robert W. Randolph. Writing instrument.
- Year 1945, n° US-2428863, applied in 1947, by Russell T. Wing. Fountain pen.