Logitech's Method for Using Two Fingers on a Touchpad
Logitech's 1998 patent describes how a touchpad can detect two fingers touching it in a specific sequence to perform actions like clicking or dragging, going beyond single-finger mouse emulation.
Original patent title: “Multiple fingers contact sensing method for emulating mouse buttons and mouse operations on a touch sensor pad”
Logitech's 1998 patent describes how a touchpad can detect two fingers touching it in a specific sequence to perform actions like clicking or dragging, going beyond single-finger mouse emulation. Granted to Logitech Inc in 1998 with 33 claims and 1,577 forward citations, and it is now in the public domain.
Coverage
What does this patent actually cover?
This patent explains a way for a touchpad to understand when two fingers are touching it, not just one. It works by scanning the touchpad to find a strong signal (a 'maxima') from a first finger, then a dip (a 'minima'), and then another strong signal from a second finger. When it finds this pattern of two strong signals separated by a dip, it knows two fingers are present. This allows the touchpad to do more than just move a cursor; it can trigger actions like a mouse click (ClaimclaimA numbered sentence at the end of a patent that legally defines what the inventor owns. The most important section.Read more → 2), a 'drag' function (Claim 3, 11), or a 'select' function (Claim 4) based on how the fingers are used and their proximity (Claim 8, 15). For example, if two fingers touch down in this sequence, it could initiate a drag operation.
The gap
What does this patent NOT cover?
- Detecting only one finger touching the sensor.
- Detecting multiple fingers without the specific sequence of two maxima separated by a minima.
- Touch sensors that do not scan to identify signal maxima and minima.
- Emulating mouse buttons or operations without detecting two fingers.
- Functions triggered by gestures that don't involve the specific two-finger maxima/minima pattern.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
Key facts
What made this novel
The innovation was in recognizing that the signal patterns from two distinct fingers touching a capacitive sensor would have a specific shape – two peaks with a valley in between. This allowed for distinguishing two-finger touches from single-finger touches and using that distinction to enable new functions.
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 Logitech touchpads for desktop computers
Some laptop touchpads from the late 1990s and early 2000s
Why it matters
The bigger picture
This patent is significant because it was filed early in the development of touch-sensitive input devices. It laid groundwork for multi-touch gestures that would later become standard on laptops and other devices, moving beyond simple cursor control to more complex interactions.
Filed
February 28, 1996
Granted
October 20, 1998
Market context
Who's building on this
Companies in this space
Logitech, the original assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →, continued to develop touch-sensitive input devices. While this patent's specific claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more → might be narrow, its underlying concepts contributed to the broader field of multi-touch technology, now implemented by virtually all major consumer electronics companies like Apple, Microsoft, and Google in their laptop and mobile device touchpads.
Market impact
This patent helped establish the idea that touchpads could do more than just emulate a mouse. It contributed to the evolution of touch input, paving the way for more sophisticated multi-touch interfaces that are now ubiquitous in laptops and mobile devices, enhancing user interaction beyond simple pointing and clicking.
Claim 1 — Plain English
What this patent covers
This patent explains a way for a touchpad to understand when two fingers are touching it, not just one. It works by scanning the touchpad to find a strong signal (a 'maxima') from a first finger, then a dip (a 'minima'), and then another strong signal from a second finger. When it finds this pattern of two strong signals separated by a dip, it knows two fingers are present. This allows the touchpad to do more than just move a cursor; it can trigger actions like a mouse click (Claim 2), a 'drag' function (Claim 3, 11), or a 'select' function (Claim 4) based on how the fingers are used and their proximity (Claim 8, 15). For example, if two fingers touch down in this sequence, it could initiate a drag operation.
The clever bit
The innovation was in recognizing that the signal patterns from two distinct fingers touching a capacitive sensor would have a specific shape – two peaks with a valley in between. This allowed for distinguishing two-finger touches from single-finger touches and using that distinction to enable new functions.
What it does not cover
- Detecting only one finger touching the sensor.
- Detecting multiple fingers without the specific sequence of two maxima separated by a minima.
- Touch sensors that do not scan to identify signal maxima and minima.
- Emulating mouse buttons or operations without detecting two fingers.
- Functions triggered by gestures that don't involve the specific two-finger maxima/minima pattern.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
Patent enters public domain
This patent is in the public domain
See the Freedom to Build guide — what is free to use, what is not, and how to cite this patent.
PatentBrief Score
Impact Score
Strong
Citation count
40/40
Highly cited
Claim breadth
20/20
Very broad protection
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
$144K – $461K
Midpoint $288K · expired or expiring · industry ×1.6
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Claim text not yet imported for this patent
The original legal language
Original claims
33 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Kasser, B., & Bisset, S. J. (1998). Logitech's Method for Using Two Fingers on a Touchpad (U.S. Patent No. 5,825,352). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/5825352/apple-pinch-to-zoom
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 Logitech's Method for Using Two Fingers on a Touchpad cover?
Logitech's 1998 patent describes how a touchpad can detect two fingers touching it in a specific sequence to perform actions like clicking or dragging, going beyond single-finger mouse emulation.
Who owns patent US 5825352?
Logitech Inc owns this patent, granted in 1998.
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 5825352 cited by?
This patent has been cited by 1577 later patents that build on its ideas.
What problem does this patent solve?
This patent is significant because it was filed early in the development of touch-sensitive input devices. It laid groundwork for multi-touch gestures that would later become standard on laptops and other devices, moving beyond simple cursor control to more complex interactions.
What does this patent NOT cover?
Detecting only one finger touching the sensor.
Patent monitoring