The Discovery of Teflon
This 1941 patent describes the creation of polytetrafluoroethylene, a slippery, heat-resistant plastic discovered by accident that became known as Teflon.
Original patent title: “Tetrafluoroethylene polymers”
This 1941 patent describes the creation of polytetrafluoroethylene, a slippery, heat-resistant plastic discovered by accident that became known as Teflon. Granted to KINETIC CHEMICALS Inc in 1941 with 74 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
The patent covers the polymerization of tetrafluoroethylene gas into a solid, white, waxy material. This substance is chemically inert, meaning it does not react with most other chemicals, and it possesses an extremely low coefficient of friction. The process involves subjecting the gas to high pressure in the presence of a catalyst to create long chains of carbon and fluorine atoms.
The gap
What does this patent NOT cover?
- Does not cover the application of the material as a non-stick coating for cookware.
- Does not cover the manufacturing process for other fluorinated polymers like PVDF.
- Does not cover the specific chemical synthesis of the monomer tetrafluoroethylene itself.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
Plunkett discovered the polymer by accident when a cylinder of gas appeared empty but still had weight; he realized the gas had polymerized into a solid inside the tank, changing chemistry forever.
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
Non-stick frying pans
Chemical-resistant gaskets and seals
Insulation for high-performance electrical wiring
Medical implants
Why it matters
The bigger picture
This patent marks the birth of the fluoropolymer industry. It enabled the development of materials that can survive extreme chemical environments and high temperatures, which were essential for the Manhattan Project and later for aerospace and consumer goods.
Filed
July 1, 1939
Granted
February 4, 1941
Market context
Who's building on this
Companies in this space
DuPont, which acquired Kinetic Chemicals, remains the primary steward of this technology. Numerous chemical manufacturers like Chemours now produce variations of this polymer for industrial and consumer use.
Market impact
The patent created an entirely new category of high-performance plastics. It allowed for the creation of components that could withstand harsh acids and extreme heat, fundamentally changing design standards in the chemical processing and aerospace industries.
Claim 1 — Plain English
What this patent covers
The patent covers the polymerization of tetrafluoroethylene gas into a solid, white, waxy material. This substance is chemically inert, meaning it does not react with most other chemicals, and it possesses an extremely low coefficient of friction. The process involves subjecting the gas to high pressure in the presence of a catalyst to create long chains of carbon and fluorine atoms.
The clever bit
Plunkett discovered the polymer by accident when a cylinder of gas appeared empty but still had weight; he realized the gas had polymerized into a solid inside the tank, changing chemistry forever.
What it does not cover
- Does not cover the application of the material as a non-stick coating for cookware.
- Does not cover the manufacturing process for other fluorinated polymers like PVDF.
- Does not cover the specific chemical synthesis of the monomer tetrafluoroethylene itself.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Early stage
Citation count
37/40
Highly cited
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
$43K – $138K
Midpoint $86K · expired or expiring · industry ×2.4
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
Plunkett, R. J. (1941). The Discovery of Teflon (U.S. Patent No. 2,230,654). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/2230654/teflon-ptfe-polymer
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 The Discovery of Teflon cover?
This 1941 patent describes the creation of polytetrafluoroethylene, a slippery, heat-resistant plastic discovered by accident that became known as Teflon.
Who owns patent US 2230654?
KINETIC CHEMICALS Inc owns this patent, granted in 1941.
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 2230654 cited by?
This patent has been cited by 74 later patents that build on its ideas.
What problem does this patent solve?
This patent marks the birth of the fluoropolymer industry. It enabled the development of materials that can survive extreme chemical environments and high temperatures, which were essential for the Manhattan Project and later for aerospace and consumer goods.
What does this patent NOT cover?
Does not cover the application of the material as a non-stick coating for cookware.
Patent monitoring