How Leo Baekeland Invented Bakelite, the First Synthetic Plastic
A 1909 patent for creating a durable, heat-resistant material by reacting phenol and formaldehyde, marking the birth of the modern plastics industry.
Original patent title: “Method of making insoluble products of phenol and formaldehyde.”
A 1909 patent for creating a durable, heat-resistant material by reacting phenol and formaldehyde, marking the birth of the modern plastics industry. Granted to Individual in 1909 with 4 forward citations.
Key facts
Coverage
What does this patent actually cover?
The patent describes a chemical process to create a hard, insoluble, and infusible substance by combining phenol and formaldehyde under specific heat and pressure conditions. By controlling the reaction, Baekeland created a resin that could be molded into complex shapes while hot and then hardened into a permanent, non-conductive solid. This material, famously known as Bakelite, was the first fully synthetic plastic that did not rely on natural resins or cellulose.
The gap
What does this patent NOT cover?
- Does not cover naturally occurring resins like shellac or amber.
- Does not cover thermoplastic materials that melt when reheated.
- Does not cover the production of other modern plastics like polyethylene or PVC.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
Baekeland discovered that by using a catalyst and precise pressure, he could force the phenol-formaldehyde reaction to stop at a moldable stage before setting into a permanent, rock-hard solid.
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
Vintage rotary telephones
Early radio casings
Electrical insulators
Jewelry and billiard balls
Why it matters
The bigger picture
This invention launched the Age of Plastics. It provided a cheap, durable, and electrically insulating material that was essential for early 20th-century electronics, automotive parts, and consumer goods. It fundamentally changed manufacturing by allowing for mass-produced, molded components.
Granted
December 7, 1909
Market context
Who's building on this
Companies in this space
Modern chemical giants like BASF and Dow continue to refine polymer science based on the foundational principles of thermosetting resins established by Baekeland.
Market impact
The patent enabled the transition from expensive, natural materials to mass-produced synthetic alternatives. It created the foundation for the global plastics industry, which now underpins almost every sector of modern manufacturing.
Claim 1 — Plain English
What this patent covers
The patent describes a chemical process to create a hard, insoluble, and infusible substance by combining phenol and formaldehyde under specific heat and pressure conditions. By controlling the reaction, Baekeland created a resin that could be molded into complex shapes while hot and then hardened into a permanent, non-conductive solid. This material, famously known as Bakelite, was the first fully synthetic plastic that did not rely on natural resins or cellulose.
The clever bit
Baekeland discovered that by using a catalyst and precise pressure, he could force the phenol-formaldehyde reaction to stop at a moldable stage before setting into a permanent, rock-hard solid.
What it does not cover
- Does not cover naturally occurring resins like shellac or amber.
- Does not cover thermoplastic materials that melt when reheated.
- Does not cover the production of other modern plastics like polyethylene or PVC.
PatentBrief Score
Impact Score
Limited data
Citation count
14/40
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
$7K – $23K
Midpoint $14K · 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
Baekeland, L. H. (1909). How Leo Baekeland Invented Bakelite, the First Synthetic Plastic (U.S. Patent No. 942,699). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/942699/bakelite-synthetic-plastic
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 Leo Baekeland Invented Bakelite, the First Synthetic Plastic cover?
A 1909 patent for creating a durable, heat-resistant material by reacting phenol and formaldehyde, marking the birth of the modern plastics industry.
Who owns patent US 942699?
Individual owns this patent, granted in 1909.
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 942699 cited by?
This patent has been cited by 4 later patents that build on its ideas.
What problem does this patent solve?
This invention launched the Age of Plastics. It provided a cheap, durable, and electrically insulating material that was essential for early 20th-century electronics, automotive parts, and consumer goods. It fundamentally changed manufacturing by allowing for mass-produced, molded components.
What does this patent NOT cover?
Does not cover naturally occurring resins like shellac or amber.
Same assignee
More from Individual
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