| Ngrams in Patent Files | Count |
|---|---|
| air pollution | 1947 |
| bio-diesel | 22 |
| bio-energy | 5 |
| bio-fuel | 6 |
| bio-fuels | 4 |
| biodegradable | 10222 |
| biodiesel | 61 |
| biodiversity | 95 |
| bioenergy | 50 |
| biofuel | 59 |
| biofuels | 56 |
| biological diversity | 35 |
| collectors? | 25605 |
| coppices? | 10 |
| cost-sharing | 8 |
| diesel engine | 4191 |
| dioxins? | 1248 |
| drinking water | 3350 |
| eco-efficiency | 4 |
| eco-labels? | 3 |
| ecosystem | 462 |
| electronic waste | 10 |
| emmisions? reduction | 1 |
| emulsification | 3963 |
| emulsions | 1182 |
| emulsions? | 44624 |
| energy balance | 792 |
| energy development | 13 |
| energy efficient | 2240 |
| energy efficienw+ | 5147 |
| energy equipment | 15 |
| energy ratios? | 305 |
| energy reduction | 214 |
| energy star program(me)? | 16 |
| energy storage | 4273 |
| energy strategies | 2 |
| energy strategy | 2 |
| energy use | 577 |
| energy window | 155 |
| engine wear | 266 |
| environmental quality | 138 |
| environmentally sustainable | 5 |
| ethanol | 64559 |
| fresh water | 3139 |
| freshwater | 576 |
| fuel consumption | 4966 |
| fuel efficiency | 1822 |
| fuel pump | 124 |
| fuel pumps? | 3659 |
| fuel quality | 169 |
| government requirements? | 53 |
| greenhouse gas | 211 |
| greenhouse gas(es)? reduction | 6 |
| greenhouse gases | 197 |
| heating systems? | 3851 |
| higher energy efficiency | 102 |
| hydropower | 53 |
| increase productivity | 739 |
| landfill | 1716 |
| liquid effluents? | 505 |
| living conditions | 159 |
| lower water usage | 4 |
| methane | 19606 |
| methanol | 52653 |
| mineral diesel | 1 |
| mortality | 8099 |
| municipal waste | 453 |
| nuclear waste | 293 |
| oil waste | 37 |
| organic certification | 4 |
| packaging waste | 67 |
| pesticides? | 5300 |
| pollution control equipment | 107 |
| pollution prevention | 103 |
| poverty | 60 |
| recyclable | 2909 |
| reduction in usage | 9 |
| risk-sharing | 4 |
| sanitation | 1462 |
| sensor | 118399 |
| solar | 11036 |
| solar collectors? | 385 |
| solar energy | 1978 |
| solar generated electricity | 4 |
| solar heating | 182 |
| solar water | 57 |
| space heating | 199 |
| species | 65355 |
| sustainability | 139 |
| sustainable | 1326 |
| sustainable development | 27 |
| sustainable energy | 16 |
| torque | 45236 |
| toxic waste | 388 |
| transesterification | 3483 |
| trombe wall | 1 |
| used vegetable oil | 6 |
| vegetable carbohydrates | 2 |
| vegetable oil | 5367 |
| viscosity | 66140 |
| viscosity reduction | 530 |
| waste cars? | 5 |
| waste disposal | 2366 |
| waste management | 620 |
| waste minimization | 57 |
| waste oil | 309 |
| waste production | 109 |
| waste recycle | 18 |
| waste reduction | 95 |
| waste streams? | 2241 |
| waste systems? | 220 |
| waste transportation | 15 |
| waste vegetable oil | 2 |
| waste water | 4476 |
| waste water treatment | 1102 |
| water contamination | 458 |
| water efficiency | 18 |
| water heating | 633 |
| water pollution | 483 |
| water scarcities | 1 |
| water scarcity | 8 |
| water supplies | 1105 |
| water supply | 7489 |
| water treatment | 3898 |
| water usage | 393 |
| white spirit | 298 |
| wind energy | 194 |
| Ngrams in Patent Files | Count |
|---|---|
| sensor | 118399 |
| viscosity | 66140 |
| species | 65355 |
| ethanol | 64559 |
| methanol | 52653 |
| torque | 45236 |
| emulsions? | 44624 |
| collectors? | 25605 |
| methane | 19606 |
| solar | 11036 |
| biodegradable | 10222 |
| mortality | 8099 |
| water supply | 7489 |
| vegetable oil | 5367 |
| pesticides? | 5300 |
| energy efficienw+ | 5147 |
| fuel consumption | 4966 |
| waste water | 4476 |
| energy storage | 4273 |
| diesel engine | 4191 |
| emulsification | 3963 |
| water treatment | 3898 |
| heating systems? | 3851 |
| fuel pumps? | 3659 |
| transesterification | 3483 |
| drinking water | 3350 |
| fresh water | 3139 |
| recyclable | 2909 |
| waste disposal | 2366 |
| waste streams? | 2241 |
| energy efficient | 2240 |
| solar energy | 1978 |
| air pollution | 1947 |
| fuel efficiency | 1822 |
| landfill | 1716 |
| sanitation | 1462 |
| sustainable | 1326 |
| dioxins? | 1248 |
| emulsions | 1182 |
| water supplies | 1105 |
| waste water treatment | 1102 |
| energy balance | 792 |
| increase productivity | 739 |
| water heating | 633 |
| waste management | 620 |
| energy use | 577 |
| freshwater | 576 |
| viscosity reduction | 530 |
| liquid effluents? | 505 |
| water pollution | 483 |
| ecosystem | 462 |
| water contamination | 458 |
| municipal waste | 453 |
| water usage | 393 |
| toxic waste | 388 |
| solar collectors? | 385 |
| waste oil | 309 |
| energy ratios? | 305 |
| white spirit | 298 |
| nuclear waste | 293 |
| engine wear | 266 |
| waste systems? | 220 |
| energy reduction | 214 |
| greenhouse gas | 211 |
| space heating | 199 |
| greenhouse gases | 197 |
| wind energy | 194 |
| solar heating | 182 |
| fuel quality | 169 |
| living conditions | 159 |
| energy window | 155 |
| sustainability | 139 |
| environmental quality | 138 |
| fuel pump | 124 |
| waste production | 109 |
| pollution control equipment | 107 |
| pollution prevention | 103 |
| higher energy efficiency | 102 |
| biodiversity | 95 |
| waste reduction | 95 |
| packaging waste | 67 |
| biodiesel | 61 |
| poverty | 60 |
| biofuel | 59 |
| solar water | 57 |
| waste minimization | 57 |
| biofuels | 56 |
| government requirements? | 53 |
| hydropower | 53 |
| bioenergy | 50 |
| oil waste | 37 |
| biological diversity | 35 |
| sustainable development | 27 |
| bio-diesel | 22 |
| waste recycle | 18 |
| water efficiency | 18 |
| sustainable energy | 16 |
| energy star program(me)? | 16 |
| waste transportation | 15 |
| energy equipment | 15 |
| energy development | 13 |
| coppices? | 10 |
| electronic waste | 10 |
| reduction in usage | 9 |
| water scarcity | 8 |
| cost-sharing | 8 |
| used vegetable oil | 6 |
| bio-fuel | 6 |
| greenhouse gas(es)? reduction | 6 |
| environmentally sustainable | 5 |
| waste cars? | 5 |
| bio-energy | 5 |
| bio-fuels | 4 |
| lower water usage | 4 |
| solar generated electricity | 4 |
| organic certification | 4 |
| risk-sharing | 4 |
| eco-efficiency | 4 |
| eco-labels? | 3 |
| waste vegetable oil | 2 |
| energy strategies | 2 |
| energy strategy | 2 |
| vegetable carbohydrates | 2 |
| trombe wall | 1 |
| water scarcities | 1 |
| emmisions? reduction | 1 |
| mineral diesel | 1 |