Inventor
CHENG HUNG-YU
TW46 patents
⚠️ This page may combine multiple inventors who share the name “CHENG HUNG-YU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
WORLD WIDE STATIONERY MFG CO
25 patentsUS6749357B2Jun 15, 2004
Ring binder mechanism
WORLD WIDE STATIONERY MFG CO118 citations98
US7404685B2Jul 29, 2008
Ring binder mechanism spring biased to a locked position when ring members close
WORLD WIDE STATIONERY MFG CO46 citations96
US7748922B2Jul 6, 2010
Ring binder mechanism with dual pivot locking elements
WORLD WIDE STATIONERY MFG CO23 citations92
US7731441B2Jun 8, 2010
Ring binder mechanism
WORLD WIDE STATIONERY MFG CO25 citations92
US7661898B2Feb 16, 2010
Soft close ring binder mechanism with reinforced travel bar
WORLD WIDE STATIONERY MFG CO28 citations92
US7534064B2May 19, 2009
Ring mechanism biased to closed and locked position
WORLD WIDE STATIONERY MFG CO39 citations92
US7524128B2Apr 28, 2009
Ring binder mechanism spring biased to a locked position
WORLD WIDE STATIONERY MFG CO35 citations92
US6007266ADec 28, 1999
Fastener for a ring binder and method of producing a binder assembly
WORLD WIDE STATIONERY MFG CO21 citations92
US8038361B2Oct 18, 2011
Ready lock ring binder mechanism
WORLD WIDE STATIONERY MFG CO7 citations84
US8002488B2Aug 23, 2011
Soft close ring binder mechanism
WORLD WIDE STATIONERY MFG CO12 citations84
US7758271B2Jul 20, 2010
Ring mechanism biased to closed and locked position
WORLD WIDE STATIONERY MFG CO11 citations84
US7744300B2Jun 29, 2010
Ready lock ring binder mechanism
WORLD WIDE STATIONERY MFG CO11 citations84
US7597498B2Oct 6, 2009
Positive lock ring binder mechanism
WORLD WIDE STATIONERY MFG CO9 citations84
US7513708B2Apr 7, 2009
Ring binder mechanism having slide connector
WORLD WIDE STATIONERY MFG CO8 citations83
US7198422B2Apr 3, 2007
Flexible strap ring binder
WORLD WIDE STATIONERY MFG CO13 citations83
US7600939B2Oct 13, 2009
Ring binder mechanism with sliding hinge plate
WORLD WIDE STATIONERY MFG CO12 citations77
US8043018B2Oct 25, 2011
Ring binder mechanism
WORLD WIDE STATIONERY MFG CO6 citations74
US7878729B2Feb 1, 2011
Intermediate connector for a ring binder mechanism
WORLD WIDE STATIONERY MFG CO6 citations74
US7762734B2Jul 27, 2010
Ring binder mechanism
WORLD WIDE STATIONERY MFG CO6 citations74
US7241067B2Jul 10, 2007
Ring mechanism having blunt ends
WORLD WIDE STATIONERY MFG CO9 citations74
US7891901B2Feb 22, 2011
Ready lock ring binder mechanism
WORLD WIDE STATIONERY MFG CO6 citations73
US7445396B2Nov 4, 2008
Hangable ring mechanism
WORLD WIDE STATIONERY MFG CO3 citations63
USD513765SJan 24, 2006
End treatment for a ring mechanism
WORLD WIDE STATIONERY MFG CO2 citations63
US6974273B2Dec 13, 2005
Ring binder
WORLD WIDE STATIONERY MFG CO4 citations63
USD514621SFeb 7, 2006
End treatment for a ring mechanism
WORLD WIDE STATIONERY MFG CO0 citations52
RICHTEK TECHNOLOGY CORP
12 patentsUS9787187B2Oct 10, 2017
Dual-constant-time buck-boost switching regulator and control circuit and method thereof
RICHTEK TECHNOLOGY CORP5 citations73
US10644600B2May 5, 2020
Constant-time buck-boost switching regulator and control circuit and control method thereof
RICHTEK TECHNOLOGY CORP6 citations72
US10097079B1Oct 9, 2018
Dual constant time switching regulator and switching control circuit and method thereof
RICHTEK TECHNOLOGY CORP4 citations72
US12249910B1Mar 11, 2025
Switching power converter and active EMI filter circuit thereof
RICHTEK TECHNOLOGY CORP0 citations54
US12034367B2Jul 9, 2024
Switching power converter and active EMI filter circuit thereof
RICHTEK TECHNOLOGY CORP1 citations54
US12055964B2Aug 6, 2024
Multi-loop power converter and multi-loop error amplifier circuit and control method thereof
RICHTEK TECHNOLOGY CORP2 citations52
US9395734B2Jul 19, 2016
Control circuit of power converter
RICHTEK TECHNOLOGY CORP1 citations50
US12273031B2Apr 8, 2025
Constant time buck-boost switching converter and modulation control circuit and control method thereof
RICHTEK TECHNOLOGY CORP0 citations44
US11171560B2Nov 9, 2021
Switching regulator having low start-up voltage and switch control circuit thereof
RICHTEK TECHNOLOGY CORP0 citations43
US12537450B2Jan 27, 2026
Switching converter circuit capable of preventing burst pulses
RICHTEK TECHNOLOGY CORP0 citations41
US12355355B2Jul 8, 2025
Switching power converter circuit and conversion control circuit and method thereof
RICHTEK TECHNOLOGY CORP0 citations41
US9041374B2May 26, 2015
Power converting circuit and control circuit thereof
RICHTEK TECHNOLOGY CORP0 citations41