Hongfei Ma

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Nanjing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Water heater, and scale detection system and method
- Patent number 11,920,923
- Issue date Mar 5, 2024
- A. O. Smith Corporation
- Tao Chen
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
Low NOx burner for a water heater
- Patent number 9,587,854
- Issue date Mar 7, 2017
- A. O. Smith Corporation
- Yonghua Cheng
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Low NOx burner for a water heater
- Patent number 9,212,817
- Issue date Dec 15, 2015
- A. O. Smith Corporation
- Yonghua Cheng
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Water heater
- Patent number 8,161,918
- Issue date Apr 24, 2012
- AOS Holding Company
- Hongfei Ma
- F24 - HEATING RANGES VENTILATING

Patents Applicationslast 30 patents

Information Patent Application
WATER HEATER, AND SCALE DETECTION SYSTEM AND METHOD
- Publication number 20220187065
- Publication date Jun 16, 2022
- A.O. SMITH (CHINA) WATER HEATER CO., LTD.
- Tao CHEN
- F24 - HEATING RANGES VENTILATING
Information Patent Application
LOW NOX BURNER FOR A WATER HEATER
- Publication number 20160061491
- Publication date Mar 3, 2016
- A.O. Smith Corporation
- Yonghua Cheng
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
LOW NOX BURNER FOR A WATER HEATER
- Publication number 20130247844
- Publication date Sep 26, 2013
- A.O. Smith Corporation
- Yonghua Cheng
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
WATER HEATER
- Publication number 20100043728
- Publication date Feb 25, 2010
- Hongfei Ma
- F24 - HEATING RANGES VENTILATING