Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4100755 | Absorption refrigeration system utilizing solar energy An absorption refrigeration system having a primary condenser-generator unit powered by solar energy, or any other suitable relatively low temperature energy source. A secondary condenser-generator unit is operatively connected to the primary unit. The se... | 07/18/1978 |
| 4070870 | Heat pump assisted solar powered absorption system An all-year heating and cooling system incorporates an absorption refrigeration machine using solar energy as a primary heat source and a compression cycle system for boosting the temperature of the heating medium supplied to the absorption machine genera... | 01/31/1978 |
| 4018581 | Solar heating system A heating system using heat derived from solar collectors to operate a reciprocating piston heat engine which provides operating power to drive a heat pump, and with additional capability to operate as a heat pump with electric motor drive, and with separ... | 04/19/1977 |
| 3960322 | Solar heat pump A heating and cooling system which uses heat derived from solar collectors to operate a heat engine which provides operating power to drive a heat pump/air conditioning system and including capability to operate either partly or wholly on supplementary en... | 06/01/1976 |
| 3953983 | Refrigeration method and refrigerating apparatus for carrying out the method Refrigerating apparatus and method including a compressor refrigerating system and an absorber refrigerating system having respective separated closed circuits in operative relationship with respect to one another such that a coolant from the compressor s... | 05/04/1976 |
