Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 4063384 | Method of and apparatus for washing sod strips, and method of sodding with washed sod strips A sod piece for sodding a soil area is formed to have the root portion thereof substantially free of soil for facilitated transportation and improved transplanting. The soil-free sod piece may be provided in a compact configuration, such as a roll or fold... | 12/20/1977 |
| 4060991 | Sub-surface irrigation method and apparatus A sub-surface irrigation method and apparatus includes a moisture control unit comprising a vessel having a float control chamber in which is mounted a float responsive valve for controlling the communication of water into the float chamber with passages ... | 12/06/1977 |
| 4057968 | Irrigation gravel guard An irrigation gravel guard is disclosed comprising a ring shaped support having a substantially conical shaped screen means secured thereto and extending therefrom. One end of the screen means is open and is secured to the ring shaped support by welding o... | 11/15/1977 |
| 4053413 | Apparatus for removing particles from water for sprinklers and the like A fine mesh, cylindrical screen is mounted on a cylindrical support lengthwise of a ditch and rotated about its axis. The screen is over half submerged, such as leaving 30% of its area above the normal water level. The rotating screen, at its downstream e... | 10/11/1977 |
| 4047995 | Hoses for irrigation by dripping and the like and the process to manufacture the same The present invention refers to hoses for irrigation by dripping and the like and to the manufacturing processes for the same. Thin plastic film produces a hose which in a single unit lies flat while empty, and oval or round when water under pressure ente... | 09/13/1977 |
| 4045909 | HYDROPONIC NUTRIENT FEEDING AND DRAINING SYSTEM Hydroponic nutrient solution is fed to a growing bed by means of a pump withdrawing liquid nutrient solution from a supply reservoir located below the bed. The nutrient solution is rapidly drained from the bed when the pump is de-energized through a dump ... | 09/06/1977 |
| 4031009 | Combined leaching and sump catch-basin A pre-cast reinforced concrete catch-basin of larger than conventional catch-basin dimensions includes a solid horizontal bottom wall with solid, hollow, cylindrical side wall upstanding therefrom to about half the height of the catch-basin. The lower hal... | 06/21/1977 |
| 4020639 | Oval pipe with a flat base The installation of pipes having oval cross sections is made easier by including an installation portion which has a flat base perpendicular to the major axis of the oval cross section.... | 05/03/1977 |
| 4006473 | Irrigation signal A housing having an electrically conductive probe depending therefrom is supported by an electrically conductive shaft which is inserted into the ground. A perceptible signal, carried by the housing, which has a source of electrical energy stored therein,... | 02/01/1977 |
| 3997112 | Year round cooling water from the cold weather of winter Cooling water at 39° F is made available at low cost all year round by erecting towers in farmer's fields and spraying the water in the air around the towers to cool the water during the winter. The cooled water is collected and stored in a lake. During ... | 12/14/1976 |
| 3992886 | Irrigation gravel guard and clean-out means therefor An irrigation pipe comprising a first elongated pipe portion, an intermediate pipe portion which extends at an angle from one end of the first pipe portion, and a second pipe portion extending from the intermediate pipe portion parallel to the first pipe ... | 11/23/1976 |
| 3982400 | Distribution valve for irrigation channels One or more domed valve closure members are operable to open and close ports in the side walls of irrigation channels. Each closure member is cantilevered by a semi-flexible arm from a frame that has a pivot point lying in a plane substantially coincident... | 09/28/1976 |
| 3968654 | Underground drain pipe coupling A coupling for joining lengths of underground drainage pipe without inhibiting the flow of water into or along the pipe.... | 07/13/1976 |
| 3961486 | Pipe for sticking down drains into the ground A tube for sticking stripformed drains into the ground has a predetermined fixed profile of rhombic cross section made by pressing two opposite corners of a square tube towards each other.... | 06/08/1976 |
| 3958761 | Water discharge device for use with irrigation systems A water discharge device for use with irrigation systems, comprising a tubular element formed with female threads at the inside surface thereof and a screw element formed with male threads at the outside surface threof, the height of said female threads b... | 05/25/1976 |
| 3951165 | Irrigation system pivot swivel A free standing swivel pipe connector for a center pivot irrigation system having a vertical water carrying conduit with pipe elbows attached to the upper and lower ends thereof. The upper portion of the pipe, including the upper elbow is rotatable around... | 04/20/1976 |
| 3950252 | Upflow filter An upflow filter adapted to be used with a home sewage treatment plant which includes a container which has a wall extending thereacross to divide the container into first and second filtering chambers. First and second gratings are located in the first a... | 04/13/1976 |
