ESTERBROOK STEEL PEN MFG CO innovation strategy

Patent filings in countries

#	Country	Total Patents
#1	United States	25
#2	Canada	2

#	Technology
#1	Writing or drawing tools
#2	Punching metal
#3	Unspecified technologies
#4	Goods for writing upon
#5	Measuring temperature
#6	Unspecified technologies
#7	Measuring force, work and fluid pressure

Publication	Filing date	Title
US2367540A	1943-09-25	Pen and fountain attachment therefor
US2367539A	1943-09-09	Pen and reservoir attachment therefor
US2390541A	1943-03-16	Writing implement
US2292381A	1940-12-24	Fountain pen feed
US2304832A	1940-08-03	Ink feeding means for writing pens
US2320369A	1939-08-31	Manufacture of metal writing pens
US2218536A	1939-01-12	Fountain pen
US2159003A	1938-05-28	Manufacture of writing pens
US2159002A	1938-05-28	Manufacture of metal stock
US2216780A	1937-11-18	Mechanical pencil
US2149263A	1937-09-30	Ink well
US2226542A	1937-04-12	Manufacture of pens or pen points
US2181830A	1936-06-26	Recording meter pen
US2156302A	1936-06-01	Blank for and method of manufacturing steel pens
US2228250A	1935-08-27	Manufacture of writing pens
US2037699A	1934-07-27	Pen and method of making the same
US1999177A	1933-01-31	Fountain pen
US1975775A	1932-01-11	Pen and pencil clip
US1918239A	1931-12-24	Fountain pen
US1939649A	1931-12-07	Fountain pen