Cross a dustmop with a cotton gin and a bissel floor sweeper.

Flat spiral CFL for floodlights

Compressed air hover furniture (or hover dolly)

"Failed Scan Count" If credic car scanners counted the number of failed scans before a successful scan, & the card issuer collected that info, they could detect worn out cards, & issue replacements.

"Bipartisan campaign signs" To reduce vandalism of political campaign signs, make signs which support both candidates.

RGB Flash for cellular microscopy (less heat, less damage to cells being photographed)

Extra slow escalators (along side stairs), to encourage people to take the stairs (and thus get some exercise), while still allowing them to ride the escalator if necessary.

Use & discard LED laser bullets -- LEDs/SEDs.

Thermoacoustic Turbine Engine

Half a cup of coffee - semicircular curved ceramic portion, flat glass portion.

Tow-behind biochar kiln, to be attached to combine harvester. Crop wastes which would normally be shredded and spread, to rot on the field, would instead be charred (and quenched) first, then spread on the field.

Supply oven for cooking food with pure oxygen, instead of regular air.

Cyclone separator for dryer lint removal

Collar lifter, allows warm air to escape shirt (for summer use)

Solar Powered Clock (PV & capacitor, or steam & weights)

Enhanced extraction from grape must by RO & water circulation. Result: less water in the liquid to be fermented.

Carousel Store signage -- aisle numbers, and lists of what's in each store aisle, go all the way around each cylindrical sign. This allows more text in a small area.

"Forever" respirator -- uses PSA gas separation to remove one specific chemical from a stream of air from the atmosphere. The chemical separated is discarded/destroyed/stored, the rest of the air is breathed.

Musak with memory. A pay radio station encrypts and transmits it's music, the reciever decrypts and stores it internally. If a thunderstorm or other EM disturbance disrupts the signal, music is played from the appropriate segment of the recording.

Small, cheap timer/alarm, with multi-week snooze button. Stick onto the HVAC air filter, etc..

Turntable coffee stirrer. Put coffee in cup on turntable, spin until coffee almost overtops sides of cup, reverse direction of spin; repeat as desired.

Cyclonic filter for household air purifier.

E-Ink children's blocks.

Remote control water heater thermostat -- this on-demand heater produces hot water that's no hotter than the hottest faucet/appliance which is using hot water, by asking each faucet/whatever what temperature is desired.

Vibration canceling motion sensor. This allows a fan to turn on if there's motion in the room, and more importantly, turn off when it's the only thing moving in the room.

Laminate newspaper as construction material -- recycled car?

Custom packed assortment

Reduce invasive species in shipping -- sterilize the ballast water.

Lego physcis engine - 2D & 3D versions

Milk in glass bottles, with empty/full exchange in supermarket. Similar to delivery, minus delivery fee.

Multi-company glass bottle size & shape standardization, to allow sterilization & reuse, rather than crushing & recycling.

Capsicum pepper pill -- as a "chill pill" to increase blood flow to skin, and make one cooler (summer use).

[Dec 22 2008, last modified Nov 19 2009]

4 stroke hybrid (+1, -2)
6 stroke improvement (+1, -1)
Absolute Pressure Cooker (+2)
AC Economizer (+1, -2)
Active Heat Pipe (0)
Adaptable Flyer Ticket (+3, -1)
Algae Firelogs (+12)
Alge Oil Extraction (+2)
Almost-Carnot Heat Engine (+1)
Anti-Anti-Antioxidant milk for tea (+4, -2)
AnyTemp Coffee Dispenser (+3, -1)
Arched Water Fountain Display (+1)
Auto-download voicemail (+3, -1)
Automatic Coffee Stirrer (+2, -2)
Automatic Dieseling Air Gun (+4, -1)
Automatic Inflatable Audience (+3, -4)
Back and Forth Osmosis Desalination (+1)
Backyard Biochar (+2, -2)
bag scale (+3, -3)
Balancing Monowheel (+2, -4)
Balloon Engine (-1)
Better CRI Lamp (+2)
Better Drink Concentrates (+4, -2)
Bicycle Car Tires (+4, -1)
Blind Navigator (+2, -1)
Boiled Gas Hybrid (+1, -3)
Boiling Cold Computer (+1, -4)
Bottle Refilling Vending Machine (+7)
Bottled Ice Cream (-1)
Captured Plug CFL Ballast (+2)
Ceiling light air freshener (+5, -1)
Ceimba (-3)
Centralia Steam Power? (+4, -1)
Centralized Hairdrying (+12, -2)
Charcoal Two Ways (+1, -1)
Cloud Nine Cruises (-4)
Colored Delivery Labels (-1)
Combined AC / HRV (+2, -1)
Condensing Water Heater Improvment (+3)
Conveyer Belt Coffee Brewer (+4)
Countertop Pressure Popper (+2, -2)
Criminal Custard Curtain (+2, -6)
Cyborg Motorcycle (+2, -4)
Cylindrical Pizza (+14, -1)
Descending Clock (+5)
Desiccant assisted AC (-4)
Desiccant Car Dehumidifier (+5)
Desiccant Clothesdryer (+3, -3)
Digitally Watermarked Alarm Sound (+5)
Disappearing ink bug spray (+5, -2)
Don't heat package warning (+5, -4)
Draw Catch Shoe Buckles (+4, -1)
Economizing Pressure Regulator (+1, -2)
Edible Internet Cafe (+7)
Electric Absorbtion Chiller (+2)
Electricity Cost on Package (+1, -4)
Enclosed CFL (+4, -2)
Entropy Exchange Dehumidifyer (+2, -2)
Escalator Slinky (+4, -3)
Exhaust Water Recovery (-1)
Exploding Algae (+1, -2)
External Combustion Gasifier (0)
Extreme Climate Heat Pump (+1, -2)
Extreme Climate thermal rebreather (+3, -3)
female mosquito tracker (+4, -2)
Fireplace Absorbtion AC (+2)
Fluidized Bed Blast Cooker (+4)
Forward Osmosis Concentrator (+3)
Fresnel sheet reflector (+9, -1)
Fuel Air Gun (+5, -3)
Fuel Efficient Stove (+2)
Fuller Fog Gun (+12, -1)
Gas Pop-Up toaster (+3)
Gecko Grip Tires (+3, -4)
Geothermal ice cream (+4)
Gift/Credit Card Consolidator (+2)
Glass Cave (+3, -4)
Gravity Torus Heat Engine (+7, -1)
HCCI Steam Hybrid (+2)
HCCI Wankel (+1, -2)
Heat/AC combo (-3)
Heat Organ (+7)
Heat Pipe Geoengineering (+1, -2)
Heat powered heat pump (+2)
Heat Pump Oven (-2)
HFCS Tax (0)
High Contrast Camera (+10)
Historical Package Month (+4, -5)
Home Cold Reservoir (+9)
Home Heat Reservoir (+1)
Hot air hybrid (-4)
Hot Power Legos (+4, -2)
Humidifying Furnace (+1, -1)
Hybrid Absorption Compression Chiller (+1)
Hybrid Dicycle (+3)
Hybrid Electric Sail Car (+1)
Hydraulic Motor Pallet Jack (+1)
Hydraulic Power Mat (+2, -3)
Hydraulic Series Hybrid Gas Turbine (+3, -1)
Hydrogen Power From Hydrothermal (-2)
Hydronic Enertia House (+2, -1)
Hydrothermal Updraft Tower (+2, -1)
Hypertext phone service (+3)
Ice cooled swirly straw (+8, -1)
infinite overdrive (+1)
Instant Alcohol (+3, -11)
Instant Tinting Glasses (+5, -1)
Key Cutting Vending Machine (+6, -2)
Key Decoration (+2, -2)
Kitchen Centrifuge (+12)
Laser Guided Car (+4, -2)
Laser Pointer (-3)
Light Source Heat Pump (+1, -1)
Liquid Elevator Counterweight (+9)
Liquid Elevator Counterweight 2 (+1, -1)
Low-energy Automobile HVAC (+3, -3)
Low Thermal Mass Lenses (+4)
Lung Engine (+2, -1)
Magnus Effect Compressor (-3)
Magnus Effect Wing Body UAV (+1)
Metal Mesh Duct Tape (+4, -1)
Microwave Thermos (+2)
Mine Fuel From the Sea (+5, -3)
Mini Ice Cream Cakes (+1, -3)
Mixed Cycle Desalination (+1)
Multi Instrument to Midi (+2, -1)
Multiprogram Multioutlet Timer (+2, -1)
Neighborhood Updraft Tower (+3, -1)
Non Energy Vampire Remote (+1)
Non Hydraulic Torque Converter (+2, -2)
O-ring bottle top (+2)
Optionally Diet Soda Fountain (+7, -3)
Osmotic Humidity Pump (0)
Paint Sheen Additive (+4)
Patterned Paint (+6, -1)
Phonetic Compression (+4, -1)
Photosynthesizing Acidophile Bioenergy (+4)
Point Source Sound Nullifier (-5)
Polarized Theater Effects (+3, -2)
Portable Electric Steam Radiator (+3, -3)
Portable Liq. Desiccant Dehumidifiyer (+1)
Power Generating Treadmill (-10)
Power Saving Charger (+5)
Pressure Activated Heated Carpet (+6)
Quieter Microwave (+2)
Retail Q&A AI (+3, -3)
Reverse Absorbtion Heat Pump (-3)
Reverse Osmosis Dehumidifyer (+3)
RGB Flash Camera (+11, -4)
Segcar (+5, -3)
SegWii (+3, -2)
Self steaming grill (+1)
Shoe heater (+5)
Silly String Mulch (+2, -1)
Small absorbtion chiller (+2)
Smelloscope (-2)
Solar/Antisolar Heating/cooling (+2)
Solar LED Bug Zapper (+4)
Solar steam hot water system (+4)
Solar Water Gas (-4)
Solid ink pen (+6, -1)
Sound Source Locator (+2, -2)
Spark Plug Capacitance (+3, -2)
Sprayable Charcoal (+4, -2)
Stirling Racecar (+4, -2)
Stovetop Instant Hot Water (+10, -1)
Suit Shaped Cedar Moth Repellent (+4)
Super Hydrophobic Honey Jar (+2, -2)
Super-micro printer (+8)
SuperSize Soap Pump (+4, -2)
tandem recumbent hydraulic (+4, -3)
Tankless Gas Point Of Use Heater (+1, -2)
Tesla Turbine Fan (+3, -1)
Thermal hydroelectric (+2)
Thermoacoustic Cooling (+2, -1)
Thermoelectric LED (-3)
Thermoelectric Toast (+4)
Through the wall dehumidifyer (+2, -1)
TiO2 Solar Catalytic Converter (-1)
Tire Inflation Manifold (+2, -1)
Tracked Sun Visor (+5)
Tuned Mass Damper Hubcap air pump (+4, -1)
Tuned Turbine Engine (+3)
Turbo Amplified Bike (+4, -1)
Ultrasound Horn (+2, -2)
Umbraloon (+15)
Urban Solar Concentrator (+3)
UV Fluorescent HUD (+2, -2)
vacuum clothesdryer (+4, -2)
Vacuum Clothesdryer 2 (-2)
Vacuum Clothesdryer 3 (+2)
Vacuum Engine (+3, -4)
Vacuum Garbage Dryer (+4, -2)
Vacuum Reducer 2 (+1, -1)
Vacuum Reducer 3 (+1)
Variable dilution spray (+4, -1)
Variable Sized Sugars (+3, -1)
Vertical Axis Pinwheel (+3, -3)
Virtual Second Display (+2, -1)
Voice to MIDI (+4)
What If x Ceased To Exist? (+6, -2)
Windshield Wash Concentrate (-4)
Wood Gasifier Steam Engine (+2, -1)
Woodgas Limelight (+4, -1)
WTC Farm (+6, -2)

halfbakery