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William Hemena — 26 Patents

IBM: 26 patents #4,017 of 70,183Top 6%

Lexington, KY: #69 of 2,526 inventorsTop 3%

Kentucky: #273 of 11,577 inventorsTop 3%

Overall (All Time): #150,017 of 4,157,543Top 4%

26 Patents All Time

William Hemena has been granted 26 US patents while listed as an inventor at IBM. The first was granted in 1996 and the most recent in March 2005. William Hemena ranks #150,017 of 4,157,543 US inventors in our database (top 3.6%). Patent records list William Hemena in Lexington, KY, US.

Patents per Year

Issued Patents All Time

Showing 1–25 of 26 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
6865094	Circuit for AC adapter to reduce power drawn from an AC power source	Randhir S. Malik, Diep N. Ho	2005-03-08	$6,470,000
6850396	Fail safe circuit with reset capability for a power supply	Raymond M. Clemo, Eino A. Lindfors, Randhir S. Malik	2005-02-01	$8,680,000
6747424	Integrated fan speed control and fault detection circuitry	Randhir S. Malik	2004-06-08	$6,083,000
6697955	Method and apparatus for using an energy reserve to provide voltage to a power factor correction circuit in the event of a power interuption	Randhir S. Malik	2004-02-24	$14,484,000
6621180	Method and system for maintaining full power during a power interruption in a multiple power supply system	Cecil C. Dishman, Eino A. Lindfors, Randhir S. Malik	2003-09-16	$13,659,000
6621718	Resonant converter circuit	Randhir S. Malik	2003-09-16	$13,659,000
6615146	Failure detection of an isolation device with PFA signal generation in a redundant power supply system	Randhir S. Malik, Eino A. Lindfors	2003-09-02	$11,479,000
6522190	High efficiency multiple input voltage sources power supply	Randhir S. Malik, Trung M. Nguyen	2003-02-18	$14,090,000
6487098	Power factor correction (PFC) circuit that eliminates an inrush current limit circuit	Randhir S. Malik	2002-11-26	$15,755,000
6487095	Multiphase zero-volt-switching resonant DC-DC regulator	Randhir S. Malik, Thai Quoc Ngo, Scott D. Strand	2002-11-26	$15,755,000
6459603	Adapter circuit for selectively doubling input voltage depending upon connector type	Randhir S. Malik	2002-10-01	$10,556,000
6448744	Power factor correction circuit	Randhir S. Malik	2002-09-10	$13,066,000
6445165	Circuit for limiting inrush current to a power source	Randhir S. Malik	2002-09-03	$9,688,000
6442052	High efficiency power converter with fast transient response	Thai Quoc Ngo, Scott D. Strand	2002-08-27	$8,564,000
6434026	Multiple output power supply circuit	Randhir S. Malik	2002-08-13	$10,700,000
6400582	Dual forward power converter utilizing coupling capacitors for improved efficiency	Thai Quoc Ngo, Scott D. Strand	2002-06-04	$11,648,000
6320771	Fault tolerant active current sharing	Randhir S. Malik	2001-11-20	$26,885,000
6297970	Multiple output synchronous rectifier circuit providing zero volt switch mode operation	Randhir S. Malik	2001-10-02	$27,385,000
6249411	Over-voltage protection circuit and method for preventing system shutdown in a power system employing multiple power supplies	Randhir S. Malik	2001-06-19	$38,179,000
6188588	Switching controller and method for operating a flyback converter in a critically continuous conduction mode	Randhir S. Malik	2001-02-13	$30,258,000
6181114	Boost circuit which includes an additional winding for providing an auxiliary output voltage	Randhir S. Malik	2001-01-30	$13,187,000
6160386	Parallel power system which includes over voltage protection	Randhir S. Malik	2000-12-12	$56,886,000
6160724	Boost doubler circuit wherein an AC bridge rectifier is not required	Randhir S. Malik	2000-12-12	$56,886,000
6157555	Current limiter responsive to changing parallel power supply capacity	Randhir S. Malik	2000-12-05	$46,958,000
6081752	Computer system having power supply primary sense to facilitate performance of tasks at power off	Paul H. Benson, Duane Thomas Crump, deceased, Duane Edward Norris, Steven T. Pancoast	2000-06-27	$38,700,000