David L. McDorman

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Beckley, WV, US

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Patents Grantslast 30 patents

Information Patent Grant
Oxygen concentrating self-rescuer device
- Patent number 11,305,135
- Issue date Apr 19, 2022
- Richard Givens
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Oxygen concentrating self-rescuer device
- Patent number 10,343,000
- Issue date Jul 9, 2019
- Richard Givens
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE

Patents Applicationslast 30 patents

Information Patent Application
OXYGEN CONCENTRATING SELF-RESCUER DEVICE
- Publication number 20190329076
- Publication date Oct 31, 2019
- Richard Givens
- A62 - LIFE-SAVING FIRE-FIGHTING
Information Patent Application
OXYGEN CONCENTRATING SELF-RESCUER DEVICE
- Publication number 20170120085
- Publication date May 4, 2017
- Richard Givens
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL