David D. Calhoun

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Duxbury, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Zero discharge water treatment apparatus and method
- Patent number 11,897,787
- Issue date Feb 13, 2024
- ZERO DISCHARGE, LLC
- David D. Calhoun
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Zero discharge water treatment apparatus and method
- Patent number 11,390,545
- Issue date Jul 19, 2022
- ZERO DISCHARGE, LLC
- David D. Calhoun
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

Patents Applicationslast 30 patents

Information Patent Application
Zero Discharge Water Treatment Apparatus and Method
- Publication number 20240343609
- Publication date Oct 17, 2024
- Zero Discharge LLC
- David D. Calhoun
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Application
ZERO DISCHARGE WATER TREATMENT APPARATUS AND METHOD
- Publication number 20230040351
- Publication date Feb 9, 2023
- Zero Discharge, LLC
- David D. Calhoun
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Information Patent Application
ZERO DISCHARGE WATER TREATMENT APPARATUS AND METHOD
- Publication number 20200339454
- Publication date Oct 29, 2020
- Zero Discharge, LLC
- David D. Calhoun
- C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE