Here is the chemtrails patent:
“A method is described for reducing atmospheric or world-wide warming resulting from the presence of heat-trapping gases in the environment, i.e., from the greenhouse impact. This kind of gases are relatively transparent to sunshine, but absorb strongly the extended-wavelength infrared radiation released by the earth. The method incudes the phase of seeding the layer of heat-trapping gases in the environment with particles of materials characterized by wavelength-dependent emissivity. Such materials include Welsbach components and the oxides of metals which have higher emissivity (and as a result minimal reflectivities) in the visible and 8-twelve micron infrared wavelength areas.”
Existing U.S. Classification: 250/505.1 244/158.1 250/503.1 250/504.00R
View patent at USPTO