% Expired Patents = 87.5

Forward Citations = 182

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3 inventors (with patents filed for the assignee):

Zezhang Hou (7 out of 12 patents)

Zezheng Hou (1 out of 1 patent)

Chaoying Zhang (1 out of 1 patent)

8 patents: Sort by Forward Citations

1. 8767972 - Auto-fit hearing aid and fitting process therefor (2014-07-01),

2. 8189830 - Limited use hearing aid (2012-05-29),

3. 7242781 - Null adaptation in multi-microphone directional system (2007-07-10),

4. 7200237 - Method and system for remotely upgrading a hearing aid device (2007-04-03),

5. 7155019 - Adaptive microphone matching in multi-microphone directional system (2006-12-26),

6. 6913578 - Method for customizing audio systems for hearing impaired (2005-07-05),

7. 6873709 - Method and apparatus for filtering and compressing sound signals (2005-03-29),

8. 6711271 - Power management for hearing aid device (2004-03-23),

Company Overview

Apherma Corporation is a leading provider of innovative and sustainable solutions for water treatment and purification. With a focus on cutting-edge technology and environmentally-friendly practices, we strive to create a healthier and more sustainable world. Our products and services range from water filtration systems to chemical-free purification methods, designed to meet the diverse needs of our customers. We are dedicated to delivering high-quality solutions that exceed expectations and contribute to a cleaner, safer future.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

8 Patents

#75 in Cupertino, CA

#8,531 in California

#35,893 in US

Cupertino, CA, United States of America

Apherma Corporation

Forward Citations = 182

3 inventors:

Zezhang Hou (7 out of 12 patents)

Zezheng Hou (1 out of 1 patent)

Chaoying Zhang (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Apherma Corporation. Retrieved from https://idiyas.com/company/apherma

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

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]