Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025

4-(2-hydroxy-1-pyrrolidinyl and 1-piperidinyl)-2H-benzo[b]-pyran-3-ol derivatives

US Patent 4640928 · Granted Feb 3, 1987

Estimated economic value: $38,000

Assignee

Inventors

View full patent text on Google Patents →