How the First Modern Kitchen Garbage Disposal Was Invented
John W. Hammes' 1933 invention of a motorized grinding device that mounts under a kitchen sink to pulverize food waste into small particles for disposal through plumbing.
Original patent title: “Garbage disposal device”
John W. Hammes' 1933 invention of a motorized grinding device that mounts under a kitchen sink to pulverize food waste into small particles for disposal through plumbing. Granted to Individual in 1935 with 43 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
The device consists of a grinding chamber mounted directly beneath a sink drain. It uses a motor to spin a shredding mechanism that forces food scraps against stationary teeth or a grinding ring. This action breaks down solid food waste into a slurry fine enough to pass through standard residential plumbing pipes without causing clogs. The system is designed to be activated by a switch, allowing users to clear food waste immediately after meal preparation.
The gap
What does this patent NOT cover?
- Does not cover non-motorized manual grinding devices.
- Does not cover industrial-scale waste management systems or sewage treatment plants.
- Does not cover composting systems or devices that do not discharge waste into the sewer line.
- Does not cover chemical-based waste breakdown methods.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
The innovation was the integration of a high-speed grinding mechanism within the confined space of a sink drain, specifically calibrated to produce particles small enough to avoid clogging household plumbing.
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
InSinkErator residential garbage disposals
Standard under-sink food waste grinders
Why it matters
The bigger picture
This patent laid the foundation for the modern residential garbage disposal, a staple appliance in millions of homes. It transformed kitchen hygiene by providing a convenient way to eliminate organic waste before it could decompose in trash bins.
Filed
May 22, 1933
Granted
August 27, 1935
Market context
Who's building on this
Companies in this space
The technology was commercialized by InSinkErator, a company founded by the inventorinventorThe person who actually conceived the invention. Listed on the patent regardless of who owns it.Read more → John W. Hammes. Today, major appliance manufacturers like Emerson Electric continue to iterate on this core design for residential and commercial markets.
Market impact
This patent effectively created the residential food waste disposer market. It shifted how households manage kitchen refuse, leading to widespread adoption of sink-mounted grinders and influencing modern residential plumbing standards and municipal waste management strategies.
Claim 1 — Plain English
What this patent covers
The device consists of a grinding chamber mounted directly beneath a sink drain. It uses a motor to spin a shredding mechanism that forces food scraps against stationary teeth or a grinding ring. This action breaks down solid food waste into a slurry fine enough to pass through standard residential plumbing pipes without causing clogs. The system is designed to be activated by a switch, allowing users to clear food waste immediately after meal preparation.
The clever bit
The innovation was the integration of a high-speed grinding mechanism within the confined space of a sink drain, specifically calibrated to produce particles small enough to avoid clogging household plumbing.
What it does not cover
- Does not cover non-motorized manual grinding devices.
- Does not cover industrial-scale waste management systems or sewage treatment plants.
- Does not cover composting systems or devices that do not discharge waste into the sewer line.
- Does not cover chemical-based waste breakdown methods.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Early stage
Citation count
33/40
Moderately 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
$6K – $20K
Midpoint $13K · expired or expiring · industry ×0.7
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
Hammes, J. W. (1935). How the First Modern Kitchen Garbage Disposal Was Invented (U.S. Patent No. 2,012,680). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/2012680/garbage-disposal-hammes
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 the First Modern Kitchen Garbage Disposal Was Invented cover?
John W. Hammes' 1933 invention of a motorized grinding device that mounts under a kitchen sink to pulverize food waste into small particles for disposal through plumbing.
Who owns patent US 2012680?
Individual owns this patent, granted in 1935.
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 2012680 cited by?
This patent has been cited by 43 later patents that build on its ideas.
What problem does this patent solve?
This patent laid the foundation for the modern residential garbage disposal, a staple appliance in millions of homes. It transformed kitchen hygiene by providing a convenient way to eliminate organic waste before it could decompose in trash bins.
What does this patent NOT cover?
Does not cover non-motorized manual grinding devices.
Same assignee
More from Individual
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