John R. Hagstrom

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Chicago, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Adjustable brass valve
- Patent number 9,595,246
- Issue date Mar 14, 2017
- John Hagstrom
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Method and use of warm-up instructional video for wind instrument
- Patent number 7,884,273
- Issue date Feb 8, 2011
- John R. Hagstrom
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS

Patents Applicationslast 30 patents

Information Patent Application
ADJUSTABLE BRASS VALVE
- Publication number 20160267891
- Publication date Sep 15, 2016
- John Hagstrom
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Application
Method and Use of Warm-Up Instructional Video for Wind Instrument
- Publication number 20100077906
- Publication date Apr 1, 2010
- John R. Hagstrom
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS