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 |
| 5019308 | Method of making a PTFE based tape suitable for impregnation into a porous metal matrix A method of making a tape suitable for impregnation into a porous metal matrix which generally includes the steps of mixing a liquid dispersion of PTFE with a coagulant to form a paste, placing the paste between a layer of supporting material and a layer ... | 05/28/1991 |
| 4999151 | Method of quality assurance in the manufacture of tablets A method for quality assurance in the manufacture of tablets. Tablet samples consisting of a plurality of tablets are taken whose actual weight is compared with their nominal weight, so that the tabletting machine is subsequently adjusted according to the... | 03/12/1991 |
| 4980340 | Method of forming superconductor The method of producing a superconducting product includes: (a) providing a pressed-powder preform consisting essentially of YBa2 Cu3 O7-x where 0.0 | 12/25/1990 |
| 4975412 | Method of processing superconducting materials and its products A method for fabricating relatively dense monoliths of superconducting material and relatively dense composite monoliths of superconducting material and binder material. The method includes the steps of placing the material to be processed in a die. A rel... | 12/04/1990 |
| 4966736 | Process for preparing sulfur having uniform particle size distribution A process and apparatus useful for preparing a porous, particulate sulfur by combining a coherent molten sulfur stream with a coherent water stream to provide an aqueous slurry of a porous, particulate sulfur having a uniform particle size distribution. I... | 10/30/1990 |
| 4964978 | Forming of felts which have an isotropic structure A method of forming felts, the fibers of which are disposed in random directions, by depositing the fibers which are carried by a current of gas on a gas-permeable conveyor, the fibers, prior to being deposited, being coated with a binder composition. The... | 10/23/1990 |
| 4961891 | Method of making high compressibility gasket material A highly compressible gasket material is formed by fusing two filled sheets of PTFE containing dispersed microballoons to a central unfilled sheet of PTFE which provides tensile strength to the material. The two unfilled sheets each constitute from 20% to... | 10/09/1990 |
| 4957668 | Ultrasonic compacting and bonding particles A method of concurrently compacting and bonding a plurality of solid particles together including combining particles with a thermobonding agent, placing the particle-agent combination in a die having a desired shape, and applying compaction pressure to t... | 09/18/1990 |
| 4957415 | Polyester composite propeller spinner and method of making same A polyester composite propeller spinner (1) has a conical wall (2), radial internal support gussets (3), and means for attaching to a propeller hub. Improved impact strength is achieved by combining a vinyl terminated liquid reactive compound with a polye... | 09/18/1990 |
| 4950444 | Process for the formation of fiber felt containing an additional product The production of mineral fiber felt into which an additional product is introduced. The felt is made partly of freshly formed fibers and partly of recycled fibers which are conveyed into a receiving chamber in which the felt is formed. The additional pro... | 08/21/1990 |
| 4950433 | Method of spray drying phenol-formaldehyde resin compositions A pre-cure resistant powder resin binder for waferboard/oriented strandboard manufacture is manufactured from spray drying a liquid resin composition containing a low advanced phenol-formaldehyde resin and a water soluble oxo compound of boron. The spray ... | 08/21/1990 |
| 4948869 | Molded article of poly (m-phenylene isophthalamide) and process for producing the same A molded article of poly (m-phenylene isophthalamide), which shows a bending strength of higher than 13 kg/mm2, a density of 1.29 to 1.33 g/cm3 and a Rockwell hardness of not less than M 120 and has an excellent electric insulation a... | 08/14/1990 |
| 4946717 | Water based precure paint for rubber articles A water based coating composition for unvulcanized rubber articles that comprises (1) a polymeric antidegradant latex, (2) an additional emulsifier, (3) a thickening agent, and (4) a filler/mold release/lubricating agent. The water based coating compositi... | 08/07/1990 |
| 4943400 | Method of manufacturing printing and embossing type elements Type capable of being used for both printing and embossing consists of a heat-curable resin and is divided into three layers. The uppermost layer constituting a typeface portion employs a finely divided granular heat-curable resin and exhibits a high hard... | 07/24/1990 |
| 4943398 | Method for manufacturing a fused cast refractory A method for manufacturing a fused cast refractory article including the steps of pouring a molten refractory material into a cavity of a mold including a casting sand held by a negative pressure applied through the sand and against a thermoplastic film w... | 07/24/1990 |
| 4942151 | Magnetic preferential orientation of metal oxide superconducting materials A superconductor comprised of a polycrystalline metal oxide such as YBa2 Cu3 O7-X (where 0 | 07/17/1990 |
| 4941948 | Wood powder-molded products using wood pulp as the binding agent Economical manufacturing of wood powder-molded products becomes possible with the introduction of wood pulp as the binding agent to be used in combination with water. The molded products feature not only high moisture absorbing capability and a unique nat... | 07/17/1990 |
| 4942007 | Continuous preparation of shaped long articles of polyimide A method of continuously forming a shaped long article of an aromatic polyimide power including supplying a powdery mixture containing an aromatic polyimide powder having a heat loss ratio of not more than 2 wt. % and a mean particle size in the range of ... | 07/17/1990 |
| 4942003 | Method for continuously producing molded members from a mixture of gypsum and fibrous material A method and apparatus for continuously producing molded member, especially sheets, from a mixture of gypsum and fibrous material. In a first mixing stage, measured-out quantities of gypsum and fibrous material are thoroughly mixed together, with the dry ... | 07/17/1990 |
| 4940556 | Method of preparing long acting formulation A long acting sustained release pharmaceutical composition for dihydropyridine calcium channel blockers wherein the calcium channel blocker and a pH-dependent binde are intimately admixed in essentially spherically shaped non-rugose particles of up to 1.2... | 07/10/1990 |
| 4940563 | Molding method and apparatus using a solid flowable, polymer medium An article is molded by contacting it with a solid polymer medium, such as an especially low strength unfilled silicone rubber which is solid and able to flow readily. Thermal expansion of the medium or mechanical force is used to create molding pressure ... | 07/10/1990 |
| 4940741 | Process for the production of hardboard A one-step process for simultaneously compressing and tempering fiberboard panel, which includes the step of applying to the panel prior to compression thereof an aqueous treating composition which comprises a polyvinyl acetate emulsion and optionally up ... | 07/10/1990 |
| 4936897 | Method for the manufacture of slow release fertilizers A method for the manufacture of physically prepared slow-release fertilizer by coating fertilizer particles with at least one layer of a substantially water insoluble metal salt formed in-situ from an organic acid having between 6 and 30 carbon atoms and ... | 06/26/1990 |
| 4937024 | Method for bonding lignocellulosic material with gaseous esters A method for bonding lignocellulosic material under heat and pressure together with steam and a gaseous ester wherein a mat of lignocellulosic material with a curable aqueous alkali solution of a phenol-formaldehyde resole binder is compressed between a p... | 06/26/1990 |
| 4937020 | Production of very fine polymer fibres The polymer granular melt (1) is whirled out of a rotating nozzle head (6) through a plurality of exit holes (24) with fibre formation (32) and the fibres formed (9) are deposited on a collecting surface (12) in web form (15). This polymer melt is introdu... | 06/26/1990 |
| 4937025 | Molding apparatus and method Methods and apparatus for making self-supporting bodies from particulate materials. The apparatus includes a mold with opposed first and second walls defining a particulate chamber therebetween. The second wall is advanceable and retractable toward and aw... | 06/26/1990 |
| 4935457 | Fiberboard method and composition A composition and method for producing a fiberboard. The fiberboard is produced from a mixture of wood-containing material, a binder, a waterproofing agent and a liquid concentrate. The liquid concentrate contains boric acid or a derivative thereof, a wat... | 06/19/1990 |
| 4935182 | Process for producing a dimensionally stable thermoplastic semifinished product A process for providing batches of a mouldable, fibre-reinforced thermoplastic material matched to a moulding to be produced and accompanied by heating, whereby a free-flowing initial product of fibers and thermoplastic material-containing binders is heat... | 06/19/1990 |
| 4935173 | Process for producing prills A prilling apparatus and process for producing seed material for size enlargement processes such as a granulation process for bisphenol. The apparatus includes a fluidized bed system with a spray header therein for producing spray droplets of material in ... | 06/19/1990 |
| 4933122 | Process and apparatus for producing beads Bead producing process and an apparatus in which sol having enzymes, plant tissues, etc. dispersed therein is dropped into a solidifying liquid through a perforated plate. The sol is fed from a sol supply tank to a position near of the outer periphery of ... | 06/12/1990 |
| 4933139 | Process for the production of Pbx Moy Sz Chevrel-phase compounds A process for the production of at least a one kilogram block of Chevrel-phase Pbx Moy Sz, wherein x=0.9 to 1.2, y=6.0 to 6.4, and z=7 to 8, includes mixing thoroughly stoichiometric quantities of starting materials in pow... | 06/12/1990 |
| 4931230 | Method for preparing radiation resistant polypropylene articles Irradiated polypropylene articles of non-crystalline mesomorphous polypropylene and a method for preparing the articles are provided. The articles are irradiated with a sterilizing dosage of ionizing radiation. The irradiated articles such as films and bl... | 06/05/1990 |
| 4931241 | Method for producing structures by isostatic compression A process for producing a green composite structure by isostatic compression and filtration. A suspension of colloidal size matrix powders is established in a carrier liquid. The suspension is incorporated into a die chamber having a filter opening contai... | 06/05/1990 |
| 4931243 | Process and apparatus for spreading a chip web Process and apparatus for spreading a chip web from a supply over a width corresponding to the web width on a substrate moving below the supply. Such spreading is accomplished according to a web height distribution specified in the web transversely to the... | 06/05/1990 |
| 4931231 | Method for manufacturing discrete pellets of asphaltic material A method and apparatus for manufacturing discrete solid particles of hydrocarbonaceous material, such as asphaltenes, in relatively dustless form includes heating the hydrocarbonaceous material, solid at standard conditions of temperature and pressure, to... | 06/05/1990 |
| 4929400 | Production of monodisperse, polymeric microspheres Very small, individual polymeric microspheres with very precise size and a wide variation in monomer type and properties are produced by deploying a precisely formed liquid monomer droplet, suitably an acrylic compound such as hydroxyethyl methacrylate in... | 05/29/1990 |
| 4929402 | Method for production of three-dimensional objects by stereolithography A system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impingi... | 05/29/1990 |
| 4927582 | Method and apparatus for creating a graduated distribution of granule materials in a fiber mat A distinctive apparatus for forming an absorbent body includes a forming chamber, and a fiber delivering mechanism for providing a flow of fibrous material within the forming chamber. A forming layer, which is located in the forming chamber and is movable... | 05/22/1990 |
| 4925601 | Method for making melt-blown liquid filter medium A process for making a melt-blown nonwoven polymeric web for use as a liquid filter medium includes increasing the air (fluid) flow and the forming distance to produce a filter medium that is more bulky and more permeable and therefore resists plugging. T... | 05/15/1990 |
| 4923649 | Pelletizing polymers A method of pelletizing polymer utilizing a liquid medium characterized in that the liquid medium boils at a temperature greater than the melting temperature of the polymer and is immiscible with the molten polymer so that (1) polymer can be heated in the... | 05/08/1990 |
