Is a house number sign patented?

Short answer: specific designs of a house number sign have been patented many times, but "a house number sign" as a general idea is not what is protected. What matters is the exact combination of features in your version.

What our index shows

107 US and WO patent publications since 2000 have a title matching “houseaddress numbersignplaque” or a close variant (our index of 9.7 million patent families; one publication per family).
Among the 103 best keyword matches we examined, 30 were published in 2020 or later, and the earliest was published in 2000.
Most frequent assignees in those matches: SAMSUNG ELECTRONICS CO LTD (6), SONY CORP (5), ALPINE ELECTRONICS INC (3), LODESTAR LICENSING GROUP LLC (3).
Most common patent classes (CPC subclasses): G11C (38), G09F (26), G06F (23), H04L (11).

Counts come from keyword matching on titles and abstracts, so they are indicative, not a legal count. Some matches are different products that share a word.

14 real patent publications related to a house number sign

House number mounting system US-2025014485-A1 2025 · HILLMAN GROUP INC
An informational plaque mounting system includes a support bracket including a base having a rear side and a front side, and at least one first pivot component at the front side; an informational plaque including a plaque front si…
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House number illumination device US-10555632-B1 2020 · SINANOVIC ELVIS
A house number illumination device for lighting a house number on a mailbox includes a housing that defines an interior space. A power module is coupled to the housing and positioned in the interior space. Each of a plurality of f…
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House number normalization for master street address guide (MSAG) address matching US-9413889-B2 2016 · GELDENBOTT GERHARD
A technique and apparatus to allow a determination of an MSAG-valid address by use of normalized house numbers included in address entries in an MSAG Address data store, to facilitate the simple match of an input civic/postal addr…
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Open house sign with interchangeable letters US-2013232837-A1 2013 · GUANILL-ELUKOWICH IRENE
An open house sign has two slats to feed letters of an open house address, date, time, directional arrow, and the like. The open house sign allows potential clients to clearly understand by reading the clear lettering, location an…
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Method and apparatus for displaying house number and building footprint in arrival screen for navigation system US-7865302-B2 2011 · ALPINE ELECTRONICS INC
A method for displaying an arrival screen for a navigation system includes the steps of receiving a house number of a destination specified by a user, retrieving map data indicating a road segment which includes the specified hous…
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LED illuminated house number and sign characters US-7685753-B2 2010 · SLOWSKI DARREL R
An illuminated, shallow weatherproof signage character has individual three dimensional back-lighted/front/side and/or silhouette-lighting, with frosted areas of plastic, with virtually no limitation on the size or number of indiv…
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Reducing the number of power and ground pins required to drive address signals to memory modules US-7289383-B2 2007 · APPLE INC
One embodiment of the present invention provides a system that reduces the number of power and ground pins required to drive address signals to system memory. During operation, the system receives address signals associated with a…
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Illuminated house address sign US-6901688-B1 2005
A house address number sign includes a first light that is activated when the level of ambient light drops below a preset level, and a second light which is manually activated to provide an easily identified alert for emergencies …
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Light emitting diode address number sign US-2004170013-A1 2004
The invention is titled Light Emitting Diode Address Number Sign and is a new concept for the illumination of house or building numbers for easy recognition at night. The new invention utilizes battery powered light emitting diode…
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Personalized house number plaques US-2004055197-A1 2004
An improved mounting plaque system for house numbering includes symbols that are mounted by means of a rear connection in order to leave the front surfaces of the symbols unmarred by holes or other connection devices. The mounting…
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House address number sign US-2002166272-A1 2002
An illuminated address display comprising (1) a housing having the following surfaces, a top, a slanted back, a front with a beveled rectangular opening, a transparent front panel, a removable top, a right, and a left side, also a…
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Electronic illuminated house sign US-6367180-B2 2002
An illuminated sign, readable during the night or day, and suitable for use as a house number display, uses a single illuminatable panel, on which a number of stencils are plac critical flicker frequency ed. Each stencil is a rect…
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Data communication apparatus and method including control of sorter to change print discharge bin according to received address signal or number of pages US-6141109-A 2000 · CANON KK
A facsimile apparatus includes a reception unit for receiving image data and a procedure signal, a detection unit for detecting a sub-address from the procedure signal received by the reception unit, a recording unit for recording…
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Mapping system with house number representation US-6035299-A 2000 · ALPINE ELECTRONICS INC
A four-byte data structure for representing alphanumeric or numeric house numbers (addresses) for use in a mapping system. The data structure has the same field size as that used for representing house numbers with numeric charact…
View on Google Patents

What this means for your idea

Because patents cover specific combinations of features, the useful question is not “has a house number sign been patented?” but “has my combination of features been described before?” Household products tend to differ in the mechanism (how something attaches, folds, dispenses or cleans) rather than the basic idea.

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Guides that help with this

First-look landscape. Not exhaustive. Not legal advice. This page lists keyword-matched publications from a limited database; it does not say whether any product is or isn't covered by a patent, whether a patent is still in force, or whether your idea is patentable. Consult a registered patent attorney or agent.