Portfolio comparison
Phillips Screw Co vs Sperry 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
Sperry Corp
Patents indexed
1
Year range
1985
Most recent
1985
softwaretelecommunicationsconsumer_electronics
Top Patents1 enriched
US 4558302· 1985
How Computers Compress Data Using Dictionary Building
Activity by Decade
1980s1
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