Portfolio comparison
Sperry Gyroscope Co Inc vs 0912139 B C Ltd
Side-by-side portfolio analysis — patents indexed, year ranges, and activity timeline.
Top Patents1 enriched
US 1242065· 1917
How Elmer Sperry Invented the Gyroscopic Compass for Ships
Activity by Decade
1910s1
Top Patents1 enriched
US RE46892· 2018
The Design of a Specialized Pouch for Men's Underwear
Activity by Decade
2010s1
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