Alvin J. Halfaker

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Grand Rapids, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Noise reduction earmuffs system and method
- Patent number 11,135,094
- Issue date Oct 5, 2021
- Alvin J. Halfaker
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Noise reduction earmuffs system and method
- Patent number 10,786,394
- Issue date Sep 29, 2020
- Alvin J. Halfaker
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Noise reduction earmuffs system and method
- Patent number 10,507,138
- Issue date Dec 17, 2019
- Alvin J. Halfaker
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Noise reduction earmuffs system and method
- Patent number 10,299,962
- Issue date May 28, 2019
- Alvin J. Halfaker
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Noise reduction earmuffs system and method
- Patent number 10,149,786
- Issue date Dec 11, 2018
- Alvin J. Halfaker
- A42 - HEADWEAR
Information Patent Grant
Helmet with embedded sound suppression ear cups
- Patent number 8,429,766
- Issue date Apr 30, 2013
- Alvin J. Halfaker
- A42 - HEADWEAR

Patents Applicationslast 30 patents

Information Patent Application
Noise Reduction Earmuffs System and Method
- Publication number 20210000652
- Publication date Jan 7, 2021
- Alvin J. Halfaker
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Application
Noise Reduction Earmuffs System and Method
- Publication number 20200113740
- Publication date Apr 16, 2020
- Alvin J. Halfaker
- A42 - HEADWEAR
Information Patent Application
Noise Reduction Earmuffs System and Method
- Publication number 20190374386
- Publication date Dec 12, 2019
- Alvin J. Halfaker
- A42 - HEADWEAR
Information Patent Application
APPARATUS AND METHOD FOR IMPROVING THE SOUND SUPPRESSION CAPABILITI...
- Publication number 20130061376
- Publication date Mar 14, 2013
- Alvin J. Halfaker
- A42 - HEADWEAR