William Hemena

This inventor holds 27 USPTO granted patents, primarily in Power Supply Circuits. Top assignee: International Business Machines Corporation. Active years: 1996-2005.

IDiyas Innovation Intelligence. (2026). Inventor Profile: William Hemena. Retrieved from https://idiyas.com/inventor/william-hemena

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 27

% Patents Active = 92.6

Average Co-Inventor Count = 2.3

ph-index = 14

Forward Citations = 556(Granted Patents)

Location History:

Lexington, KY (US) (1996)
Raleigh, NC (US) (2000 - 2005)

Company Filing History:

27 out of 166,351

International Business Machines Corporation

patents

Years Active: 1996-2005

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Areas of Expertise:

AC Adapter

Power Supply

Fault Detection

Power Factor Correction

High Efficiency

Resonant Converter

Transient Response

Inrush Current

Voltage Regulation

Synchronous Rectifier

Current Limiter

Isolation Device

27 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6865094 - Circuit for AC adapter to reduce power drawn from an AC power source (2005-03-08),

2. 6850396 - Fail safe circuit with reset capability for a power supply (2005-02-01),

3. 6747424 - Integrated fan speed control and fault detection circuitry (2004-06-08),

4. 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 (2004-02-24),

5. 6621718 - Resonant converter circuit (2003-09-16),

6. 6621180 - Method and system for maintaining full power during a power interruption in a multiple power supply system (2003-09-16),

7. 6615146 - Failure detection of an isolation device with PFA signal generation in a redundant power supply system (2003-09-02),

8. 6522190 - High efficiency multiple input voltage sources power supply (2003-02-18),

9. 6487098 - Power factor correction (PFC) circuit that eliminates an inrush current limit circuit (2002-11-26),

10. 6487095 - Multiphase zero-volt-switching resonant DC-DC regulator (2002-11-26),

11. 6459603 - Adapter circuit for selectively doubling input voltage depending upon connector type (2002-10-01),

12. 6448744 - Power factor correction circuit (2002-09-10),

13. 6445165 - Circuit for limiting inrush current to a power source (2002-09-03),

14. 6442052 - High efficiency power converter with fast transient response (2002-08-27),

15. 6434026 - Multiple output power supply circuit (2002-08-13),

Title: Innovations of William Hemena: Pioneering Power Supply Solutions

Introduction

William Hemena is an accomplished inventor based in Raleigh, NC, USA, with an impressive portfolio of 27 patents. His work primarily focuses on electrical engineering, and he has made significant contributions to the field, particularly in power supply technologies. His innovations are aimed at improving efficiency and safety in electrical systems.

Latest Patents

Two of William Hemena's latest patents showcase his innovative approach to power supply management. The first patent pertains to a "Circuit for AC Adapter to Reduce Power Drawn from an AC Power Source." This invention features a rectifier bridge that converts AC voltage and employs a conversion circuit to generate a DC voltage. An opto-coupler monitors the output connection, preventing unnecessary power draw when a system is not connected, thereby reducing heat generation and enhancing energy efficiency.

The second patent is titled "Fail Safe Circuit with Reset Capability for a Power Supply." This invention focuses on safety, shutting down a power supply if a preset threshold is exceeded, and enabling a reset to return to normal operation after a fault condition. It includes a switch, a current sense resistor, and a latch mechanism to ensure that the system operates safely and reliably.

Career Highlights

William Hemena has carved a niche for himself at the International Business Machines Corporation (IBM), where he has applied his expertise to develop innovative solutions in the electrical engineering sector. His extensive experience has allowed him to contribute valuable insights and advancements in power supply technology.

Collaborations

Throughout his career, William Hemena has collaborated with talented individuals, including his colleagues Randhir Singh Malik and Thai Quoc Ngo. Together, they have shared ideas and knowledge, enabling the development of cutting-edge solutions that address contemporary challenges in power management.

Conclusion

William Hemena's contributions to the field of electrical engineering, primarily through his patents, demonstrate his dedication to innovation. His work not only advances the technology behind power supplies but also has the potential to make a significant impact on energy efficiency and safety in various applications. As he continues to innovate, the engineering community eagerly anticipates the future developments and insights he will bring forth.

Profile summary based on public USPTO records.

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]