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 |
| 4253805 | Rotary compressor A rotary compressor includes a casing 1 having a curved rotor chamber 2 in which is mounted a rotor 6. The compressor has an outlet valve 10 consisting of two valve units 10a, 10b which are located on inclined support surfaces 12 and outlet passages 11 fr... | 03/03/1981 |
| 4236901 | Air cleaner with secondary air filter element A cylinder primary air filter element is coaxially disposed within a cylindrical shell between an air intake pipe and an outlet provided in the shell. A resilient secondary air filter element is deformably secured in an opening formed in a sidewall of the... | 12/02/1980 |
| 4218407 | Valved or progressively opening sparger with rigid upper seat A sparger for efficient liberation of air when submerged in a body of liquid comprises a pressure-opened closure biased upwardly to constrict the discharge of air under a rigid annular seat member. Air is thus discharged at an exactly predetermined and co... | 08/19/1980 |
| 4199309 | Circular cavity discharge valve A compressor discharge valve assembly utilizing a cylindrical cavity in which is provided a discharge flow control valve and a valve stop for limiting the opening movement of the valve during operation of the compressor. The discharge valve chamber define... | 04/22/1980 |
| 4195660 | Reed valve Disclosed herein is a reed valve comprising a reed plate having apertures therein defining a first port and a second port together with seats respectively extending along the periphery of each of the ports. The reed valve also includes a first reed member... | 04/01/1980 |
| 4180042 | Fuel-air mixture regulator for internal combustion engines A fuel-air mixture regulator for multiple cylinder four-cycle internal combustion engines is positioned between the carburetor and the intake manifold whereby the fuel and air mixture flowing from the carburetor passes through the fuel-air mixture regulat... | 12/25/1979 |
| 4179883 | Reed valve assembly A reed valve assembly in which a gummous material coating is applied to the noise-propagating passageway of a secondary-air exhaust gas recombustion system for internal combustion engines.... | 12/25/1979 |
| 4168722 | Feather valve A feather valve is presented having shock absorbing strips in the guard section to absorb impact loads and dampen vibration of the feather strips.... | 09/25/1979 |
| 4131135 | One way check valve construction A one-piece integral construction check valve molded of resinous plastic material is disclosed. The valve has a body and a cover including first and second cover portions. The first cover portion is hingedly connected to the body and the second cover port... | 12/26/1978 |
| 4127369 | Pressure valve for a rotary piston compressor A pressure valve arranged in a rotary piston compressor which valve is mounted in a passage or bore of the housing casing of the compressor. The last mentioned passage is axis parallel to the rotary piston compressor axis. The valve has a cylindrical cros... | 11/28/1978 |
| 4099544 | Vent valve of an air pump A vent valve of an air pump for charging air into a fish bowl which comprises a separator wall having an insertion vent hole, a valve body made of a silicone rubber and consisting of a disc-shaped tongue section having a semi-circular portion of a small d... | 07/11/1978 |
| 4083184 | System to supply air into the exhaust conduit of an internal combustion engine A reed valve device having two reeds capable of selectively closing and opening the corresponding openings formed in the device is snugly fitted in a casing through an elastomeric sealing member without using any other connecting means. The casing communi... | 04/11/1978 |
| 4082295 | Reed valve with crankshaft seal and method The improvement in a reed valve for use between crankcase chambers of a two-stroke engine, comprising a flat, ring-shaped steel insert having a rubber coating on one side thereof and including a sealing lip on the I.D. thereof. One insert is secured on ea... | 04/04/1978 |
| 4076047 | Reed valve An improvement in valves for suction or exhaust passages of an internal combustion engine, wherein the projection of the plane of the fixing seat of the valve plate and the plane of the valve seat are not parallel. The fixing seat can be tapered. The valv... | 02/28/1978 |
| 4058138 | Straightway valve A straightway valve comprising a body with a through hole accommodating a coaxially mounted sleeve. The sleeve is secured to the body at the side where a working fluid is admitted into the sleeve. The sleeve is arranged so that there is a passage between ... | 11/15/1977 |
| 4009366 | Thermal pulse type heater and valve therefore A cylindrical valve body is secured within the body of the heater and includes a venturi inlet to reduce flow restrictions through the valve. A flexible flap valve spans the inner bore of the body at approximately 45° so that it only has to be moved thro... | 02/22/1977 |
| 3998243 | Flapper valve for a rotary compressor The flapper valve is to be utilized in a compressor of the type having a valve chamber adjacent a discharge or outlet port. The valve comprises a flexible valve member in the valve chamber which has a port closure at the front end thereof to seal the disc... | 12/21/1976 |
| 3981276 | Induction-exhaust system for a rotary engine An induction and exhaust system for a rotary engine is disclosed which has a wing-type reed valve assembly disposed in the intake port of said system and effective to respond instantaneously to a back-flow differential pressure for closing the intake port... | 09/21/1976 |
| 3949716 | Speed limiting governor for internal combustion engine A speed governor for an internal combustion engine comprises a flexible reed having a portion overlying the air intake aperture of the carburetor. The overlying portion of the reed is movable by flexing of the reed from a normal open position to a closed ... | 04/13/1976 |
| 3939867 | Valve for compressors A valve structure for compressors or the like comprising a flexible valve body normally seated over an exhaust aperture in the compressor and a valve catcher connected jointly with the valve body at one end to a valve plate and extending at an angle above... | 02/24/1976 |
