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E21F17/12

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EFIXED CONSTRUCTIONS E21Mining E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere

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E21F17/12Dam doors

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Patents Grantslast 30 patents

Information Patent Grant
Door system for a mine stopping
- Patent number 6,032,986
- Issue date Mar 7, 2000
- Jack Kennedy Metal Products and Buildings
- William R. Kennedy
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Door frame and door assembly for a mine stopping
- Patent number 4,523,406
- Issue date Jun 18, 1985
- John M. Kennedy
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
Information Patent Grant
Door for a mine stopping having knife-edge hinges
- Patent number 4,373,294
- Issue date Feb 15, 1983
- John M. Kennedy
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Door frame and door assembly for a mine stopping
- Patent number 4,118,894
- Issue date Oct 10, 1978
- John M. Kennedy
- E21 - EARTH DRILLING MINING
Information Patent Grant
Mine stopping device and method of constructing same
- Patent number 4,096,702
- Issue date Jun 27, 1978
- Willard J. Burton
- E21 - EARTH DRILLING MINING
Information Patent Grant
Door for a mine stopping
- Patent number 4,082,331
- Issue date Apr 4, 1978
- John M. Kennedy
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES

Patents Applicationslast 30 patents

Information Patent Application
MINE DOOR
- Publication number 20170107817
- Publication date Apr 20, 2017
- Jack Kennedy Metal Products & Buildings, Inc.
- William R. Kennedy
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Application
MINE STOPPING PANEL AND METHOD OF MANUFACTURE
- Publication number 20150260041
- Publication date Sep 17, 2015
- Jack Kennedy Metal Products & Buildings, Inc.
- William R. Kennedy
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
Mine door leaf and method of manufacture thereof
- Publication number 20030079423
- Publication date May 1, 2003
- William R. Kennedy
- E21 - EARTH DRILLING MINING