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| Number | Title | Issue Date |
| 4809592 | Ventilating construction and method of making the same A ventilating construction, such as for a cold frame or for other desired structures, and method of making the same are provided, the ventilating construction comprising a sheet of material having an opening therethrough a flap hinged to the sheet for ope... | 03/07/1989 |
| 4671011 | Heat gain and retention structure, particularly a cold frame An insulated cold frame includes an insulated box having an upwardly extending insulated rear wall and a rigid insulated cover rotatable about a horizontal axis from a sealed position to a fully open position. A glazing cover inside the insulated cover pe... | 06/09/1987 |
| 4242833 | Greenhouse and method of growing plants in cold climates A greenhouse construction and method of growing plants in cold climates employing a water layer defining in part a growing environment which transmits solar radiation into the interior of an enclosure constituting the growing environment. The water layer ... | 01/06/1981 |
| 4005547 | Thermally responsive ventilated cold frame A cold frame for providing an environment conducive to the growing of plants having walls and a flexible, light-transmitting cover member which is flexed to form a ventilation opening. The cover member is flexed manually or by means responsive to the temp... | 02/01/1977 |
| 3946521 | Ventilated plant protector A plant protector having an elongated housing side wall opening over which is movably mounted a closure panel, the panel being pivoted on the housing at one end of the opening and being connected at the other end of the opening to a heat sensitive expansi... | 03/30/1976 |
