51
Sanders David A: Liquid crystal display device and method of making. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, September 23, 1975: US3908052 (46 worldwide citation)

Liquid crystals are packaged in conveniently usable sheet form to provide a colored display of unusual brilliance. The products are made by enclosing the liquid crystals in contiguous shallow closed cells between films heat sealed along cell-defining lines.


52
Lunde George G, Opseth Stan J: Electrographic recording process and apparatus employing synchronized recording pulses. Minnesota Mining & Manufacturing Company, Alexander Sell Steldt & DeLaHunt, October 21, 1975: US3914771 (46 worldwide citation)

An improved electrographic recording process and apparatus are provided wherein a recording medium is arranged between two spaced opposed electrodes, one of which is in contact with one side of the recording medium, and the other of which is a recording electrode that indirectly contacts the opposit ...


53
Fayling Richard E, Campbell Douglas D: Magnetic security document and method for making same. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, April 15, 1975: US3878367 (45 worldwide citation)

A security document having a magnetic recording layer containing uniformly dispersed magnetizable material having magnetic anisotropy wherein the material at a plurality of selected locations is differently physically aligned with respect to a reference location to provide a magnetically detectable ...


54
Nicholson Geoffrey C, Collins John E: Projector. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, October 29, 1974: US3844650 (45 worldwide citation)

A device for projecting a modulated light beam on a viewing screen, wherein modulation is achieved by electronic actuation of an electro-optical assembly utilizing a thin liquid crystal layer.


55
David L Braun, John A Trine: Vapor sampling device. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, April 20, 1976: US03950980 (44 worldwide citation)

A device for measuring the presence or time-average amounts of at least one selected gas in a mixture thereof which comprises an enclosure having therewithin at least one substance which interacts with the gas to be monitored. Attenuating means associated with the enclosure regulate gas movement wit ...


56
Dee Lynn Johnson: Method for the alteration of a lens and an adhesive lens blocking pad used therein. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, June 15, 1976: US03962833 (44 worldwide citation)

A method for altering a lens whereby a lens is securely bonded to a lens block by a lens adhesive blocking pad having means for accurately aligning the optical center, and optionally the cylinder axis, of the lens with the center point and cylinder axis of the lens block. The invention also includes ...


57
Lloyd W Legacy, Thomas R McAvoy, Leonard E Nelson: Abrasive articles. Minnesota Mining and Manufacturing Company St Paul MI, Kinney Alexander Sell Steldt & Delahunt, September 5, 1972: US3688453 (44 worldwide citation)

Abrasive belts suitable for offhand and automated article finishing provide a uniform finish without lapping or parting lines. The belts comprise a lofty non-woven web securely needle tacked to a woven backing and impregnated with resin and abrasive.


58
Wolff Robert E: Magnetic tape position sensing. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, January 21, 1975: US3861619 (43 worldwide citation)

A length of magnetic tape extending along a tape path in a cartridge shell and having its ends wound one on each of a pair of reel hubs is formed adjacent each end with a repetitive pattern of holes. The patterns of holes at the two ends of the tape are different to distinguish the ends from each ot ...


59
Steinhauser Armin H, Baratto Eugene L: Roll of pressure sensitive adhesive, adhesive coated abrasive discs and dispenser. Minnesota Mining & Manufacturing Company, Alexander Sell Steldt & DeLaHunt, November 26, 1974: US3849949 (43 worldwide citation)

A convolutely wound roll of pressure-sensitive adhesive coated abrasive discs is wound on a core without a protective release liner. A dispenser suitable for individually dispensing the abrasive discs from the roll having a severing edge substantially narrower than the diameter of the discs to be di ...


60
Barber Jr Loren L: Encapsulated isocyanurate catalyst. Minnesota Mining and Manufacturing Company, Alexander Sell Steldt & DeLaHunt, January 14, 1975: US3860565 (43 worldwide citation)

A one-part, room temperature-latent isocyanate-catalyst system trimerizable to polyisocyanurate is formed comprising an aromatic isocyanate having dispersed throughout liquid microcapsules of a catalyst for isocyanurate formation. The microcapsules have a permeable shell wall essentially of partiall ...