Invention Grant
- Patent Title: Sound systems for model railroad locomotives
- Patent Title (中): 示范铁路机车的音响系统
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Application No.: US12176275Application Date: 2008-07-18
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Publication No.: US07954435B2Publication Date: 2011-06-07
- Inventor: Frederick E. Severson
- Applicant: Frederick E. Severson
- Applicant Address: US OR Beaverton
- Assignee: QS Industries, Inc.
- Current Assignee: QS Industries, Inc.
- Current Assignee Address: US OR Beaverton
- Agency: Stolowitz Ford Cowger LLP
- Main IPC: H04R1/00
- IPC: H04R1/00
Abstract:
On-board model railroad speaker enclosure designs are presented that allow maximum sized speakers, improve impedance matching of sound to the outside of the locomotive, and isolate back and front speaker waves while maintaining the standard horizontal drive-train in model train locomotives.
Public/Granted literature
- US20090016556A1 SOUND SYSTEMS FOR MODEL RAILROAD LOCOMOTIVES Public/Granted day:2009-01-15
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