Portfolio comparison
Hovercraft Development Ltd vs Sikorsky Aircraft Corp
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Company A
Hovercraft Development Ltd
Patents indexed
1
Year range
1967
Most recent
1967
automotiveaerospacemechanicaltransportation
Top Patents1 enriched
US 3321037· 1967
How Hovercrafts Use Flexible Skirts to Ride on Air
Activity by Decade
1960s1
Top Patents1 enriched
US 1994488· 1935
Igor Sikorsky's Early Design for a Vertical Takeoff Aircraft
Activity by Decade
1930s1
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