How Mary Anderson Invented the Windshield Wiper
A 1903 invention by Mary Anderson that allowed drivers to manually clear rain and snow from their windshields using a lever inside the vehicle.
Original patent title: “Window-cleaning device.”
A 1903 invention by Mary Anderson that allowed drivers to manually clear rain and snow from their windshields using a lever inside the vehicle. Granted to Individual in 1903 with 5 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
The device consists of a swinging arm with a rubber blade attached to a lever inside the car. When the driver moves the lever, the arm pivots across the glass to clear away moisture or debris. It was designed to improve visibility during bad weather without requiring the driver to stop the car and exit to clean the windshield manually.
The gap
What does this patent NOT cover?
- Does not cover automatic or motorized wiper systems.
- Does not cover sensors that detect rain to trigger wiping.
- Does not cover intermittent or variable speed control mechanisms.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The innovation was moving the control mechanism inside the cabin, separating the human operator from the external environment while maintaining direct mechanical control of the cleaning arm.
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 20th-century manual windshield wipers
Vintage automobile restoration parts
Why it matters
The bigger picture
Before this invention, drivers had to stop their vehicles and step out into the elements to wipe their windshields by hand. Anderson's patent provided a safer, more practical way to maintain visibility, which was essential as automobiles became more common and travel speeds increased.
Filed
June 18, 1903
Granted
November 10, 1903
Market context
Who's building on this
Companies in this space
While the original patent has long expired, every major automotive manufacturer like Ford, Toyota, and Volkswagen builds on the fundamental concept of windshield clearing systems. Modern suppliers like Bosch and Denso continue to iterate on the efficiency and automation of these systems.
Market impact
This patent established the necessity of driver-controlled visibility systems in automobiles. It transitioned the windshield wiper from a luxury or aftermarket accessory to a standard safety feature required by law in most jurisdictions today.
Claim 1 — Plain English
What this patent covers
The device consists of a swinging arm with a rubber blade attached to a lever inside the car. When the driver moves the lever, the arm pivots across the glass to clear away moisture or debris. It was designed to improve visibility during bad weather without requiring the driver to stop the car and exit to clean the windshield manually.
The clever bit
The innovation was moving the control mechanism inside the cabin, separating the human operator from the external environment while maintaining direct mechanical control of the cleaning arm.
What it does not cover
- Does not cover automatic or motorized wiper systems.
- Does not cover sensors that detect rain to trigger wiping.
- Does not cover intermittent or variable speed control mechanisms.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Limited data
Citation count
16/40
Early citations
Claim breadth
0/20
Narrow claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
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
$3K – $9K
Midpoint $5K · expired or expiring · industry ×0.9
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Concepts involved
Citations
Patent lineage
Cite this patent
Anderson, M. (1903). How Mary Anderson Invented the Windshield Wiper (U.S. Patent No. 743,801). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/743801/windshield-wiper-anderson
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 Mary Anderson Invented the Windshield Wiper cover?
A 1903 invention by Mary Anderson that allowed drivers to manually clear rain and snow from their windshields using a lever inside the vehicle.
Who owns patent US 743801?
Individual owns this patent, granted in 1903.
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 743801 cited by?
This patent has been cited by 5 later patents that build on its ideas.
What problem does this patent solve?
Before this invention, drivers had to stop their vehicles and step out into the elements to wipe their windshields by hand. Anderson's patent provided a safer, more practical way to maintain visibility, which was essential as automobiles became more common and travel speeds increased.
What does this patent NOT cover?
Does not cover automatic or motorized wiper systems.
Same assignee
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