The Patent Finder

Aphex Systems, Ltd.

Also on record
Records under this name other than patents Aphex Systems, Ltd. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.

Back to Aphex Systems, Ltd.

PatentTitleStatus Expires Confidence
US 8,290,169Time shifted harmonics generator
Formerly held
In force
 · From the USPTO record
In forceFrom the USPTO record
US 6,266,423Microphone output limiter
Formerly held
Term ended
Term ended Apr 15, 2018 · From the USPTO record
Term endedTerm ended Apr 15, 2018From the USPTO record
US 6,160,448Digitally-controlled low noise variable-gain amplifier
Lapsed on the fee record
Ended Dec 12, 2008 · From the USPTO record
Lapsed on the fee recordEnded Dec 12, 2008From the USPTO record
US 4,939,471Impulse detection circuit
Term ended
Term ended no later than Jul 3, 2010 · Low confidence
Term endedTerm ended no later than Jul 3, 2010Low confidence
US 5,115,471High frequency expander device
Term ended
Term ended no later than May 19, 2012 · Low confidence
Term endedTerm ended no later than May 19, 2012Low confidence
US 5,155,769Discrete parallel path modulation multiplexer
Term ended
Term ended no later than Oct 13, 2012 · Low confidence
Term endedTerm ended no later than Oct 13, 2012Low confidence
US 5,334,947Logic enhanced noise gate
Formerly held
Term ended
Term ended no later than Aug 2, 2014 · Low confidence
Term endedTerm ended no later than Aug 2, 2014Low confidence
US 5,359,665Audio bass frequency enhancement
Formerly held
Term ended
Term ended no later than Oct 25, 2014 · Low confidence
Term endedTerm ended no later than Oct 25, 2014Low confidence
US 5,422,602Frequency discriminate leveler
Formerly held
Term ended
Term ended no later than Jun 6, 2015 · Low confidence
Term endedTerm ended no later than Jun 6, 2015Low confidence
US 5,424,488Transient discriminate harmonics generator
Formerly held
Term ended
Term ended no later than Jun 13, 2015 · Low confidence
Term endedTerm ended no later than Jun 13, 2015Low confidence
10 of 20 patents shown.
Pro members see all 20.
Pro members: see all 20 patents
The Patent Finder CompaniesExpirationsCalculatorWatchlistPricing MethodologyCorrectionsLegalPrivacysupport@thepatentfinder.com Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited