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 |
| 4019539 | Hollow flexible tubular body, process and apparatus for making the same A hollow flexible tubular body which comprises at least one tubular layer. The layer is formed by adjacent helical windings having hooked edges and substantially flat sections. The turns of the helix do not show any spontaneous tendency to increase in dia... | 04/26/1977 |
| 4011615 | Personnel transfer gangway A gangway for transferring personnel between a ship and a fixed structure is formed by first and second mating extensible members which are arranged to form a platform. Springs are mounted inside the platform which permit the first and second members to e... | 03/15/1977 |
| 4009734 | Coiled tubing A flexible self-retracting coiled tubing having desirable recoil strength and elastic memory is described. The coiled tubing is adaptable especially as a self-retracting air tube for transmitting fluids under pressure to pneumatic equipment. The coiled tu... | 03/01/1977 |
| 4003408 | Underground irrigation porous pipe A porous pipe primarily of rubber and synthetic rubber reclaimed from rubber tires, ground to a relatively small granular size, with metal removed; such as, for example, would pass through a 30-mesh screen, process-mixed through a pipe extruder, with a mu... | 01/18/1977 |
| 3996968 | Tubing articles A tubing article is fabricated from a fluid permeable fibrous plexifilamentary polyolefin material having a porosity &3xb5; of 0.5 to 0.7, a contact angle of greater than 85°, and a Gurley-Hill porosity in the range of 4 to 70 sec/100 cc. The tubing is p... | 12/14/1976 |
| 3983906 | Impression packer sleeve An impression sleeve for use in an impression packer comprising a smooth rolled sheet adapted to be connected on the outside of a packer to form an impression cover therefor, said sheet composed of about 60% to 80% by weight synthetic nitrile rubber, abou... | 10/05/1976 |
| 3948289 | Flow regulators It is known to construct fluid dispensing structures which utilize tubes or conduits which expand or contract in cross-section in accordance with the internal pressure of a fluid within such a tube or conduit in combination with one or more flow control m... | 04/06/1976 |
| 3945403 | Tube construction for fastener profile strips A tube construction for providing releasably interlocking fastener strips to be attached to the surface of film for bags including an elongate thin plastic tube having a range of gauges from 0.0015 inch to 0.005 inch with at least six shaped plastic profi... | 03/23/1976 |
| 3936417 | Coilable polyvinyl chloride products and methods and compositions for producing the same Polyvinyl chloride pipe capable of being coiled and uncoiled under conditions involved in installing under ground by plowing in, and having characteristics meeting requirements necessary for use in natural gas distribution, and compositions and methods fo... | 02/03/1976 |
