How Modern Rollerblades Became Adjustable and Interchangeable
A 1982 patent describing a skate design that allows users to swap between wheels and blades and adjust their position on the boot for better performance.
Original patent title: “Skate having an adjustable blade or wheel assembly”
A 1982 patent describing a skate design that allows users to swap between wheels and blades and adjust their position on the boot for better performance. Granted to Individual in 1985 with 8 claims and 46 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
This patent describes a mechanical mounting system that attaches a wheel or blade assembly to the bottom of a boot. The system uses an elongate channel built into a frame, which is fixed to the boot's sole. The wheel or blade assembly slides into this channel and is held in place by a close-fitting mechanical interface, specifically using projections on the assembly that lock into recesses within the frame's side walls. A manually operable fastener then secures the assembly at a specific longitudinal position, allowing the skater to shift the wheels or blades forward or backward to suit their skating style.
The gap
What does this patent NOT cover?
- Does not cover skates where the wheels are permanently riveted or molded directly into the boot sole.
- Does not cover non-adjustable wheel frames that lack the longitudinal displacement mechanism.
- Does not cover ice skates that use a traditional screw-in mounting plate without the described channel-and-projection locking system.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The invention uses the geometry of the channel walls—specifically the depth-to-width ratio—to create a rigid, stable connection that resists the high lateral forces of skating while remaining easily removable.
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
Early Rollerblade brand inline skates
Convertible ice-to-inline skate systems
Performance inline skates with adjustable frame positioning
Why it matters
The bigger picture
This design was foundational to the commercial success of inline skating in the 1980s and 90s. By allowing a single boot to be customized with different wheel configurations or swapped for a blade, it helped transition inline skates from niche training tools for hockey players into a mass-market consumer product.
Filed
July 21, 1982
Granted
January 8, 1985
Market context
Who's building on this
Companies in this space
The technology was popularized by Scott Olson, who founded the Rollerblade company. Today, major manufacturers like K2 Sports and Powerslide continue to refine these modular frame attachment systems for both recreational and professional speed skating.
Market impact
This patent helped standardize the modular frame design for inline skates, enabling the rapid growth of the inline skating industry in the 1990s. It provided a blueprint for manufacturers to offer versatile products that could adapt to different skating surfaces and user preferences, effectively creating the modern inline skate market category.
Claim 1 — Plain English
What this patent covers
This patent describes a mechanical mounting system that attaches a wheel or blade assembly to the bottom of a boot. The system uses an elongate channel built into a frame, which is fixed to the boot's sole. The wheel or blade assembly slides into this channel and is held in place by a close-fitting mechanical interface, specifically using projections on the assembly that lock into recesses within the frame's side walls. A manually operable fastener then secures the assembly at a specific longitudinal position, allowing the skater to shift the wheels or blades forward or backward to suit their skating style.
The clever bit
The invention uses the geometry of the channel walls—specifically the depth-to-width ratio—to create a rigid, stable connection that resists the high lateral forces of skating while remaining easily removable.
What it does not cover
- Does not cover skates where the wheels are permanently riveted or molded directly into the boot sole.
- Does not cover non-adjustable wheel frames that lack the longitudinal displacement mechanism.
- Does not cover ice skates that use a traditional screw-in mounting plate without the described channel-and-projection locking system.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Early stage
Citation count
33/40
Moderately cited
Claim breadth
5/20
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
$30K – $95K
Midpoint $59K · 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
8 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Olson, S. B. (1985). How Modern Rollerblades Became Adjustable and Interchangeable (U.S. Patent No. 4,492,385). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/4492385/inline-skates-rollerblade-olson
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 Modern Rollerblades Became Adjustable and Interchangeable cover?
A 1982 patent describing a skate design that allows users to swap between wheels and blades and adjust their position on the boot for better performance.
Who owns patent US 4492385?
Individual owns this patent, granted in 1985.
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 4492385 cited by?
This patent has been cited by 46 later patents that build on its ideas.
What problem does this patent solve?
This design was foundational to the commercial success of inline skating in the 1980s and 90s. By allowing a single boot to be customized with different wheel configurations or swapped for a blade, it helped transition inline skates from niche training tools for hockey players into a mass-market consumer product.
What does this patent NOT cover?
Does not cover skates where the wheels are permanently riveted or molded directly into the boot sole.
Same assignee
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