Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 5839824 | Concrete mixer A concrete mixer including a mixing shell and a void located therein for receiving material to form concrete. The concrete mixing mechanism having a first blade mechanism spatially orientated to have a pitch capable of moving at least a portion of the mat... | 11/24/1998 |
| 5320248 | Mixing bucket and integral mold The mixing bucket and integral mold (10) has frustoconical walls (12), a bottom wall (14), a bottom rim (32) and top rim (24). A lid (16) closes and seals the bucket. A bail (28) is provided for lifting and carrying the bucket. A flange (38) that is integ... | 06/14/1994 |
| 5056924 | System for mixing and dispensing concrete An assembly which is adapted for mounting inside a mixing drum and a mobile system for mixing and dispensing concrete includes fin structure for mixing and guiding a substance when the mixing drum is rotated. The fin structure is constructed of a lightwei... | 10/15/1991 |
| 4950082 | Mixing apparatus A mixing apparatus for use in mixing liquids such as paints or oil base stains wherein the mixing apparatus consists of a plurality of inwardly extending perimeter baffles and upwardly extending inner baffles to obstruct the free flow of liquid during the... | 08/21/1990 |
| 4892411 | Asphalt mixer apparatus and method The present invention relates to a continuous drum dryer mixer apparatus and method for heating and drying virgin aggregates, as well as recycled asphaltic pavement materials and mixing such materials with liquid asphalt cement and other ingredients to fo... | 01/09/1990 |
| 4730934 | Mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete In a mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete, in a mixing drum (1) which, on its inner wall (9), has one or more flat elevators (11, 12) following a helix and extending from the closed dru... | 03/15/1988 |
| 4423961 | Feed mixing apparatus A feed mixing apparatus for use wherever livestock is cared for and fed. The apparatus has a portable base and a shaft mounted rotatable cylindrical drum with internal mixing and conveying blades. A frame grate on the base is positioned in front of a cyli... | 01/03/1984 |
| 4338732 | Lifter cage for asphalt plant, dryers and drum mixers An asphalt plant apparatus is disclosed having a material lifter cage arranged in coaxial relationship within a mixing drum. The lifter cage includes a plurality of cage lifters having a trough-like configuration for collecting material in the drum and sp... | 07/13/1982 |
| 4322170 | Apparatus for the preparation of PVC-powder The disclosure refers to a method and apparatus for the preparation of PVC powder and the processing thereof to form plastic products, with care being paid to the material and also energy-saving. The PVC powder with additives is brought very quickly to a ... | 03/30/1982 |
| 4300837 | Device for the preparation of coated bituminous products for road surfacing The device includes in a rotary cylindrical drum (1) a zone for transfer and heating (11) where the inner surface of the drum (1) is fitted with sections of blades (17) wound in a spiral across the drum (1). These blades (17) arranged projecting with resp... | 11/17/1981 |
