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Patents found on Lightbulb boxes

• BRITISH THOMSON HOUSTON CO LTD / Mazda
• 1925 212938 Improvements in and relating to methods of and apparatus for marking glass articles
• 1925 223204 (General Electric Stem-making machine ) Improvements in and relating to machines for making glass stems for electric lamps
• 1925 226215 Improvements in and relating to the manufacture of tipless incandescent lamps
• 1924 226455 Improvements in spiral tungsten filaments
• 1925 228189 Improvements in and relating to headlamps
• 1925 228907 Improvements in and relating to frosted glass articles
• 1925 231449 Improvements in and relating to incandescent lamps for vehicle headlamps
• 1929 247923 (US)Improvements in and relating to machines for making electric incandescent lamps
• 1927 250974 Improvements in and relating to vibration resisting filaments for electric incandescent lamps
• 1929 272934 (US) Improvements in and relating to basing machines for electric incandescent lamps
• 1928 289478 Improvements in and relating to the manufacture of incandescent electric lamps
• 1928 298351 Improvements in and relating to caps for electric incandescent lamps and similar articles
• 1931 352063 Improvements in or relating to electric lamps for vehicle head lamps and the like
• 1935 GB425653 Improvements in and relating to mountings for electric motor car headlight lamps

• G E C (UK) / Osram
• 1920 147293 (GEC) Improvements in and relating to electric incandescent lamps and similar articles and methods of and apparatus for manufacturing the same (Pipless bulbs)
• 1921 155851 (GEC) Improvements in and relating to metals and their manufacture
• 1922 183118 (GEC) Improvements in the manufacture of metal filaments for electric incandescent lamps
• 1922 186497 (COLIN JAMES SMITHELLS; GEN ELECTRIC CO LTD) Improvements in or relating to the manufacture of tungsten
• 1924 226455 (GEC) Improvements in spiral tungsten filaments (Coiled coil)
• 1925 228907 (BTH) Improvements in and relating to frosted glass articles and methods of making same
• 1926 249796 (GEC) Improvements in the manufacture of electric lamps with light diffusing or coloured bulbs
• 1928 288827 (ROBERT BRISKE) Improvements in or relating to electric incandescent lamps coiled filaments process

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