Portfolio comparison
Central Investment Corp vs Amazon com Inc
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Company A
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
Company B
Amazon com Inc
Patents indexed
1
Year range
1999
Most recent
1999
ecommercesoftwaretelecommunications
Top Patents1 enriched
US 5960411· 1999
How Amazon's One-Click Ordering Works for Online Purchases
Activity by Decade
1990s1
How to use
Bookmark a comparison URL to save it. Format: /compare/companies?a=[slug]&b=[slug]. Also see patent-level comparison.