Sir WG Armstrong Whitworth and Co Engineers Ltd

Sir WG Arm

Active Patents

Total Holdings

Patent Holdings

Patent No.	Title	Status	Filing Date	Grant Date	Actions
US1920830A	Method of making propeller blades	Expired / Lapsed	1932-01-27	1933-08-01	Details
US1380823A	Clutch for turbine-driven geared propeller-shafts	Expired / Lapsed	1920-07-20	1921-06-07	Details
US1353025A	Electrical signaling apparatus	Expired / Lapsed	1919-04-15	1920-09-14	Details