How the 2x2x2 Magnetic Puzzle Cube Works
A 1970 patent for a 2x2x2 puzzle cube held together by magnets that allows groups of pieces to rotate around three axes to solve a color-matching challenge.
Original patent title: “Pattern forming puzzle and method with pieces rotatable in groups”
A 1970 patent for a 2x2x2 puzzle cube held together by magnets that allows groups of pieces to rotate around three axes to solve a color-matching challenge. Granted to Moleculon Research Corp in 1972 with 14 claims and 75 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
The patent describes a puzzle made of eight cube-shaped pieces that form a larger composite cube. Each piece has magnets on its hidden faces to keep the structure together while allowing specific groups of four cubes to rotate around three perpendicular axes. By rotating these groups, a user can scramble the colors on the outer faces and then attempt to restore the original pattern. The mechanism relies on the ability to move sets of four pieces independently without the entire cube falling apart.
The gap
What does this patent NOT cover?
- Does not cover 3x3x3 puzzle cubes (like the Rubik's Cube) which use a central internal mechanism rather than magnets on cube faces.
- Does not cover puzzles that use mechanical interlocking tracks or internal stems instead of magnetic attraction to hold pieces together.
- Does not cover non-cube geometries that do not allow for the rotation of sets of four pieces around three perpendicular axes.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The innovation lies in using magnetic attraction on the internal, non-exposed faces of the cubes to maintain structural integrity while simultaneously acting as a low-friction bearing surface for rotation.
The Patent Drawing
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Magnetic 2x2x2 puzzle cubes
Early prototypes of group-rotation puzzles
Why it matters
The bigger picture
This patent predates the famous 3x3x3 Rubik's Cube and represents an early exploration of the group-rotation puzzle concept. It highlights the transition from simple static toys to complex mechanical puzzles that require spatial reasoning and algorithmic thinking to solve.
Filed
March 4, 1970
Granted
April 11, 1972
Market context
Who's building on this
Companies in this space
Modern puzzle manufacturers continue to refine the 2x2x2 cube design, often incorporating internal magnets to improve rotation feel and alignment. Companies like MoYu and GAN produce high-performance versions of this specific geometry for competitive speedcubing.
Market impact
This patent established the fundamental logic for group-rotation puzzles, which later exploded into a massive global market for mechanical brain teasers. While the 3x3x3 Rubik's Cube became the cultural icon, the 2x2x2 magnetic variant remains a staple in the puzzle industry for both beginners and collectors.
Claim 1 — Plain English
What this patent covers
The patent describes a puzzle made of eight cube-shaped pieces that form a larger composite cube. Each piece has magnets on its hidden faces to keep the structure together while allowing specific groups of four cubes to rotate around three perpendicular axes. By rotating these groups, a user can scramble the colors on the outer faces and then attempt to restore the original pattern. The mechanism relies on the ability to move sets of four pieces independently without the entire cube falling apart.
The clever bit
The innovation lies in using magnetic attraction on the internal, non-exposed faces of the cubes to maintain structural integrity while simultaneously acting as a low-friction bearing surface for rotation.
What it does not cover
- Does not cover 3x3x3 puzzle cubes (like the Rubik's Cube) which use a central internal mechanism rather than magnets on cube faces.
- Does not cover puzzles that use mechanical interlocking tracks or internal stems instead of magnetic attraction to hold pieces together.
- Does not cover non-cube geometries that do not allow for the rotation of sets of four pieces around three perpendicular axes.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Moderate
Citation count
38/40
Highly cited
Claim breadth
9/20
Moderate scope
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$50K – $158K
Midpoint $99K · expired or expiring · industry ×2.2
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
The original legal language
Original claims
14 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Nichols, L. D. (1972). How the 2x2x2 Magnetic Puzzle Cube Works (U.S. Patent No. 3,655,201). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/3655201/rotating-cube-puzzle
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How the 2x2x2 Magnetic Puzzle Cube Works cover?
A 1970 patent for a 2x2x2 puzzle cube held together by magnets that allows groups of pieces to rotate around three axes to solve a color-matching challenge.
Who owns patent US 3655201?
Moleculon Research Corp owns this patent, granted in 1972.
When does this patent expire?
This patent has expired and is now in the public domain — anyone can use the invention freely.
What is patent US 3655201 cited by?
This patent has been cited by 75 later patents that build on its ideas.
What problem does this patent solve?
This patent predates the famous 3x3x3 Rubik's Cube and represents an early exploration of the group-rotation puzzle concept. It highlights the transition from simple static toys to complex mechanical puzzles that require spatial reasoning and algorithmic thinking to solve.
What does this patent NOT cover?
Does not cover 3x3x3 puzzle cubes (like the Rubik's Cube) which use a central internal mechanism rather than magnets on cube faces.
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