Vacuum tube based audio amplifier
The stippling in the Figures on the front face and the transformer devices represents a pastel color and while shown intermittently is understood to be extended uniformly across the entire surface upon which it is applied.
The wood-pattern lines shown in the Figures indicate that the surface portions of the amplifier comprise a wood appearance. The specific wood grain pattern depicted in the figures is for illustrative purposes only.
The broken-line disclosure in the views is understood to form part of the claimed design.
Claims
The ornamental design for a vacuum tube based audio amplifier, as shown and described.
1905276 | April 1933 | Erickson |
2497747 | February 1950 | Valdettaro |
D371787 | July 16, 1996 | Sohn |
D489705 | May 11, 2004 | Sabnani |
D508478 | August 16, 2005 | Nakajima |
D525613 | July 25, 2006 | Masui |
D598004 | August 11, 2009 | Lam |
D669992 | October 30, 2012 | Schafer et al. |
D678863 | March 26, 2013 | Inada |
D702211 | April 8, 2014 | Kim |
D702663 | April 15, 2014 | Kim |
D713379 | September 16, 2014 | Kim |
D729762 | May 19, 2015 | Hu et al. |
Type: Grant
Filed: Aug 10, 2017
Date of Patent: Mar 20, 2018
Inventor: Eric J. Lundgard (Midland, MI)
Primary Examiner: Keli L Hill
Application Number: 29/613,548