Door lifting device

Details Door lifting device Door lifting device

2011-06-21

2011-06-21

Ramirez, Cynthia (Department: 2911)

Material or article handling equipment

Conveying, lifting, or transferring article

Design Patent

active

D0640441

CLAIM:
The ornamental design for a door lifting device, as shown and described.

REFERENCES:
patent: 1694173 (1928-12-01), Goranson
patent: 2989286 (1961-06-01), Gillespie
patent: 4834339 (1989-05-01), Clarke
patent: 4846443 (1989-07-01), Collins et al.
patent: 5048795 (1991-09-01), Vitale
patent: 6079696 (2000-06-01), Bette
patent: 6296230 (2001-10-01), Roth
patent: 6497399 (2002-12-01), Nelson
patent: D595472 (2009-06-01), Kimura
patent: D602671 (2009-10-01), McMorris et al.
patent: 2010/0044657 (2010-02-01), Patrick et al.

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