Tone Commanders Systems, Inc.

Also on record

Records under this name other than patents Tone Commanders Systems, Inc. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.

Showing 1 to 7 of 7 · Back to Tone Commanders Systems, Inc.

Patent	Title	Status	Expires	Confidence
US 4,086,441	Message-waiting and do-not-disturb communications system Term ended Term ended no later than Apr 25, 1998 · Low confidence	Term ended	Term ended no later than Apr 25, 1998	Low confidence
US 4,086,444	Dial pulse key telephone intercom system Term ended Term ended no later than Apr 25, 1998 · Low confidence	Term ended	Term ended no later than Apr 25, 1998	Low confidence
US 4,158,110	Tone selective key telephone intercom system including digital tone detector Term ended Term ended no later than Jun 12, 1999 · Low confidence	Term ended	Term ended no later than Jun 12, 1999	Low confidence
US 4,188,511	Multi-link telephone intercom system Term ended Term ended no later than Feb 12, 2000 · Low confidence	Term ended	Term ended no later than Feb 12, 2000	Low confidence
US 4,258,232	Line hold circuits Term ended Term ended no later than Mar 24, 2001 · Low confidence	Term ended	Term ended no later than Mar 24, 2001	Low confidence
US 4,292,475	Expandable link telephone intercom system Term ended Term ended no later than Sep 29, 2001 · Low confidence	Term ended	Term ended no later than Sep 29, 2001	Low confidence
US D245,871	Telephone communications module Term ended	Term ended