Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene

Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene

US Patent 5169990 · Granted Dec 8, 1992

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Multiple temperature-control process for workpieces by means of a triplex furnac2025
Equipment for distribution of electric power2024
Vacuum valve for closing a flow path with a two-part valve disk2020
Power relay for a vehicle2019
Power relay for a vehicle2019
Method for simplified real-time diagnoses using adaptive modeling2015
Form locking connection with compensation of position errors2015
Valve for the substantially gas-tight interruption of a flow path2013
Divided disk brake arrangement2010
Defining form formats with layout items that present data of business applicatio2009
Method for simplified real-time diagnoses using adaptive modeling2006
Method of monitoring a fuel cell unit2006