Manhole guard

Details Manhole guard Manhole guard

2007-04-03

2007-04-03

Clark, Doris (Department: 2914)

Building units and construction elements

Prefabricated unit

Underground service vault

Design Patent

active

29234385

CLAIM:
The ornamental design for a manhole guard, as shown and described.

REFERENCES:
patent: 1370166 (1921-03-01), Thiel
patent: 2393126 (1946-01-01), Stevenson
patent: 3426659 (1969-02-01), Clarke et al.
patent: 3722730 (1973-03-01), Joos
patent: D245104 (1977-07-01), Gross
patent: 4048766 (1977-09-01), Dantzer et al.
patent: 4121390 (1978-10-01), Hall et al.
patent: 4973191 (1990-11-01), Dannhauser
patent: 5295557 (1994-03-01), Taylor
patent: 5843306 (1998-12-01), Singleton
patent: 6004457 (1999-12-01), Singleton
patent: D453225 (2002-01-01), Andexler

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