Portfolio comparison
Phillips Screw Co vs Central Investment Corp
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Company A
Phillips Screw Co
Patents indexed
1
Year range
1936
Most recent
1936
mechanicalautomotiveconsumer_electronics
Top Patents1 enriched
US 2046343· 1936
The Invention of the Phillips Head Screw
Activity by Decade
1930s1
Company B
Central Investment Corp
Patents indexed
1
Year range
1973
Most recent
1973
consumer_electronicsmechanical
Top Patents1 enriched
US 3735375· 1973
How Vacuum Tubes Detect Tiny Changes in High-Resistance Sensors
Activity by Decade
1970s1
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