Intercom base unit

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Intercom

Design Patent

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Design Patent

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D0521489

CLAIM:
The ornamental design for an intercom base unit, as shown and described.

REFERENCES:
patent: D185798 (1959-08-01), Loge
patent: D210026 (1968-01-01), Kahn
patent: D211092 (1968-05-01), Kahn
patent: D247561 (1978-03-01), Peterson
patent: D307587 (1990-05-01), Marcune
patent: D324864 (1992-03-01), Hector
patent: D327480 (1992-06-01), Soren
patent: D341593 (1993-11-01), Chang
patent: D349284 (1994-08-01), Robertus
patent: D349285 (1994-08-01), Robertus
patent: D349286 (1994-08-01), Robertus
patent: D371784 (1996-07-01), Gertz
patent: D429231 (2000-08-01), Johnsson
patent: D450308 (2001-11-01), Benders
patent: D493441 (2004-07-01), Sabick et al.
patent: D494152 (2004-08-01), Sabick et al.
patent: 2003/0134666 (2003-07-01), Fletcher et al.
Photograph of Old Intercom Unit used by Greyfield Industries, undated.

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