Road structure – process – or apparatus – Pavement – Vault cover-closure
Reexamination Certificate
2006-05-24
2008-03-11
Hartmann, Gary S. (Department: 3671)
Road structure, process, or apparatus
Pavement
Vault cover-closure
C137S371000, C220S816000
Reexamination Certificate
active
07341398
ABSTRACT:
A lift-assisted manhole cover assembly with a flush surface and external pivot shaft. The cover includes a mounting tab that extends beyond the general periphery of the cover. The mounting tab may be connected to a shaft that is threadedly engaged with the frame. A spring may be mounted between the frame and the mounting tab, for example, in a sleeve, to provide a mechanical assist in lifting the cover. The sleeve may be disposed outside the manhole opening where it does not block access to the manhole opening.
REFERENCES:
patent: 544409 (1895-08-01), Jauch
patent: 1225679 (1917-05-01), Ranshousen
patent: 1314306 (1919-08-01), Cullison
patent: 1399759 (1921-12-01), Fullenwider
patent: 1634029 (1927-06-01), Korkames
patent: 1992354 (1935-02-01), Coleman
patent: 2295909 (1942-09-01), Massey
patent: 2439978 (1948-04-01), Konchan
patent: 3262227 (1966-07-01), Pentecost
patent: 3561162 (1971-02-01), Goldman
patent: 4038789 (1977-08-01), Axgarde
patent: 5184422 (1993-02-01), Wade
patent: 5451119 (1995-09-01), Hondulas
patent: 5507590 (1996-04-01), Argandona
patent: 5531541 (1996-07-01), Clover et al.
patent: 5788406 (1998-08-01), Hernandez
patent: 6035581 (2000-03-01), McCoy
patent: 6095365 (2000-08-01), Yielding
patent: 6446307 (2002-09-01), Wilkins
patent: 2005/0244227 (2005-11-01), Akkala
patent: 19514636 (1995-10-01), None
Austin William R.
Barnum Herbert Carl
Beal Scott B.
Garringer Rex A.
Johnson Jeremy I.
East Jordan Iron Works, Inc.
Hartmann Gary S.
Warner Norcross & Judd
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