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 |
| 7310965 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 12/25/2007 |
| 7275320 | Tube cutter having a relative movement generating portion A tube cutter having a relative movement generating portion including a relative movement generating portion, a tube cutting base and a tube cutting slider. A manual input portion of the relative movement generating portion is to be held by a user's hand. A cutting ... | 10/02/2007 |
| 7159319 | Tube cutter having retractable tool device A tube cutter includes a handle having a chamber to slideably receive a casing of a tool device, the casing includes an aperture and two side openings communicating with a U-shaped groove, a tool member includes a shank rotatably received in the aperture of the casi... | 01/09/2007 |
| 7159412 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 01/09/2007 |
| 7127819 | Ratchet scissors Provided is scissors comprising a movable first handle unit; a stationary second handle unit including a bifurcated jaw, a pivotal blade in the jaw, a spring biased pivotal plate member in the jaw and including teeth, a gear and ratchet wheel assembly, and a spring ... | 10/31/2006 |
| 7073346 | Compressor head, internal discriminator, external discriminator, manifold design for refrigerant recovery apparatus and vacuum sensor The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 07/11/2006 |
| 7013567 | Hand held pipe cutters A pipe cutter comprises a rotary head having an axis of rotation, and a housing gear is coaxial with the rotary head such that the housing gear and rotary head have a common axis of rotation. A pipe slot extends into the rotary head and the housing gear, and a pipe ... | 03/21/2006 |
| D515254 | Chew toy for animals | 02/14/2006 |
| 6481105 | Pipe cutter A pipe cutter includes a handle, a power-forcing handle, a position recovery member, a drive device, a revolving member, and a cutter device combined together. The handle and the power-forcing handle are pivotally combined together, and pressing the power... | 11/19/2002 |
| 6345444 | Hand held apparatus for transverse cutting of a not easily accessible pipe A hand-held apparatus for cutting transversely a pipe using a slitter co-operating with rollers to produce a deepening cut, is formed of two half-shells mounted opposite around the pipe with adjustable clamping elements one at least supporting a slitter o... | 02/12/2002 |
| 5425395 | Tapping tee assembly The tapping apparatus includes a body that receives a cutter and sleeve. The cutter and sleeve advance together to form an opening in the sidewall of a main conduit about which the body is secured. The sleeve includes external threads that grip into the c... | 06/20/1995 |
| 4531288 | Pipe-cutter with cutter wheels and yokes The invention relates to an on-site pipe-cutter assembly which is intended for manual sectioning of rigid, large-diameter pipes located in narrow trenches. The pipe-cutter assembly includes two yokes (1,2) which are connected at their associated ends by t... | 07/30/1985 |
| 4438562 | Manual pipe cutter A manual pipe cutter that comprises a cutting disk and a cutter-pressing jaw to press the cutting disk edgewise against a pipe to cut it, and is characterized by a pushbutton and gear arrangement for convenient operation and forceful pressing of the cutti... | 03/27/1984 |
| 4416062 | Self centering pipe cutting device A self centering pipe cutting device having opposing cutting and roller support assemblies which are automatically advanced in concurrent, converging relationship as the cutting device is rotated about the pipe being cut. A ratchet and advancing gear adap... | 11/22/1983 |
| 4305205 | Open ended tubing cutters A self-clamping cutting tool which includes a handle (11) attached to a C-shaped housing (12) and has an opening (13) sized to admit a pipe (23). Rotatably mounted within the housing is a C-shaped tool body (24) carrying a set of clamping rolls (27, 28 an... | 12/15/1981 |
| 4296551 | Racheting pipe cutter A ratchet pipe cutter having a pipe-receiving body and a lever arm for turning the pipe-receiving body. The pipe-receiving body is cylindrical and has a turning gear at one end and cutting wheels for cutting pipe at the other end. The pipe-receiving body ... | 10/27/1981 |
| 4224737 | Pipe cutter with easily detachable handle A ratchet-type pipe cutter is provided for cutting pipes in close quarters. The pipe cutter includes a split-ring cutting head adapted to be clamped about the pipe to be cut, a cutter mounted on the head for cutting the pipe upon rotation of the cutting h... | 09/30/1980 |
| 4177557 | Tube cutter with a ratchet handle A tube cutter comprises an elongated handle formed in two longitudinal halves and having a C-shaped head at one end also formed into halves and defining an opening through which a tube can be inserted, a C-shaped body rotatably mounted within the two half... | 12/11/1979 |
| 4157615 | Pipe cutter of the ratchet type A pipe cutter incorporating a ratchet handle. A tubular open-ended rigid body, adapted to surround the pipe to be cut, carries a cutting wheel and a jaw adjustable towards and away from the cutting wheel. An elongated handle has a ring member at one end r... | 06/12/1979 |
| 4149312 | Pipe cutter A pipe cutter for cutting installed pipes comprises a frame which can be fitted round the pipe and which carries a cutting tool and pipe engaging rollers; a feeding mechanism in the frame derives a drive from rotation of the frame around the pipe to feed ... | 04/17/1979 |
