Duct design calculator

- Carrier Corporation
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Description

FIG. 1 is an isometric view of a duct design calculator showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a right end elevational view; and

FIG. 4 is a bottom plan view.

Referenced Cited
U.S. Patent Documents
D256472 August 19, 1980 Sulek et al.
D271025 October 18, 1983 Li
D279381 June 25, 1985 Leung
D283515 April 22, 1986 Li
D284199 June 10, 1986 Li
D285094 August 12, 1986 Li
D286161 October 14, 1986 Wong
Patent History
Patent number: D289414
Type: Grant
Filed: Jun 19, 1985
Date of Patent: Apr 21, 1987
Assignee: Carrier Corporation (Syracuse, NY)
Inventors: David C. Peters (Liverpool, NY), Derek P. Williams (Manlius, NY), William C. Chadwick (Syracuse, NY)
Primary Examiner: Louis S. Zarfas
Attorney: David J. Zobkiw
Application Number: 6/746,480
Classifications
Current U.S. Class: With Keyboard (D18/7)