Sight glass

The ornamental design for a sight glass, as shown and described.

FIG. 1 is a left front perspective view of a sight glass showing my new design, the bottom is a mirror image of the top;

FIG. 2 is a front elevational view thereof, the undisclosed rear is unornamented and not part of the claimed design; and,

FIG. 3 is a right side elevational view thereof, the left side is a mirror image.

Patent	Priority	Assignee	Title
D614680,	Jul 28 2009	A O SMITH CORP	Sight glass and frame
D684617,	Nov 28 2011	MICRO WORLD CORP.; MICRO WORLD CORP	Optical device
D706328,	Nov 28 2011	MICRO WORLD CORP.	Optical device
D887470,	Dec 31 2017	ASSISTECH SP Z O O	Eye platform

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3935656,	May 17 1974		Picture frame system
4282668,	Nov 20 1979	Product Planning & Development, Inc.	Mounting system and method

Executed on	Assignor	Assignee	Conveyance	Frame	Reel	Doc
Jul 26 2005	SPRAGUE, CURTIS	Branham Corporation	ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS	016943	0943	pdf
Jul 27 2005		Branham Corporation	(assignment on the face of the patent)

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