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Now showing items 11-20 of 21
Removable Arthropod Repellent Device for Attachment to the Ear of an Agricultural Animal
(U.S. Patent and Trademark Office, 1976-03-09)
An arthropod repellent device for attachment to the pinnal portion of the ear of an agricultural animal, such as a cow, horse, sheep, goat, swine or the like, including a band or belt of flexible plastic material of about ...
Apparatus for Providing Ac Electrical Energy at a Preselected Frequency
(U.S. Patent and Trademark Office, 1972-05-16)
A method and apparatus for providing AC electrical energy at a preselected frequency including a driven AC generator having an externally excitable field, means connected to the generator field for exciting the field at ...
Intermittent Positive Pressure Breathing Device
(U.S. Patent and Trademark Office, 1977-11-08)
A ventilator implemented completely with fluidic devices provides independent control of inhalation time, exhalation time and breathing gas flow rate. The basic fluidic system comprises a low frequency oscillator which in ...
Ellipoidal Mirror Reflectometer Including Means for Averaging the Radiation Reflected from the Sample
(U.S. Patent and Trademark Office, 1970-04-07)
An ellipsoidal mirror reflectometer for measuring the reflectance of materials includes a source of monochromatic light, an ellipsoidal mirror reflector with an aperture therein, a specimen support position at the first ...
Self-contained Solar Greenhouse
(U.S. Patent and Trademark Office, 1979-11-06)
A solar heated greenhouse formed with a rectangular floor having parallel sides and ends, a quonset type roof structure supported above the floor, the roof extending to the floor sides, the roof being formed of an inner ...
Azasteroids Compounds and Derivatives
(U.S. Patent and Trademark Office, 1976-10-19)
Azasteroids and certain derivatives each of a five ring system containing at least one aromatic nucleus and at least one nitrogen atom. The ring system is fused to a tetrahydrotetralin system or a tetrahydrophenanthrene ...
Field Modulated Alternator System and Control Therefor
(U.S. Patent and Trademark Office, 1973-04-10)
A polyphase alternator of basic frequency F.sub.2 with a field circuit excited with alternating current of frequency F.sub.1, and including full wave rectifier means across each phase of the alternator, all connected in ...
Dispersed Growth Biological Sewage Treatment Process
(U.S. Patent and Trademark Office, 1973-10-30)
A dispersed growth biological secondary sewage treatment process for removing dissolved organic material and suspended solid material from sewage including metabolizing the dispersed biological solids to yield new cell ...
High Pressure Storage Vessel
(U.S. Patent and Trademark Office, 1972-11-28)
A method of manufacture of a high pressure gas storage vessel having a body of particles in the form of a porous solid mass, a conduit having one end within the porous solid body, the conduit extending from the body providing ...
Aggregate Surface Area Measurement Method
(U.S. Patent and Trademark Office, 1975-10-28)
Method and apparatus for determining the exposed surface area of a plurality of samples of selected mineral aggregate particles which have previously been coated with asphalt and subsequently partially stripped of asphalt. ...