Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Spiro indoline-pyranobenzoxazinones

Spiro indoline-pyranobenzoxazinones

US Patent 4831142 · Granted May 16, 1989

Estimated economic value: $4,753,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Photochromic compound and articles containing the same1990
Photochromic article1990
Photochromic spiro(indoline)benzoxazines1989
Method for synthesizing spiro-oxazines1988
Photochromic compound and articles containing the same1988
Photochromic compound and articles containing the same1987