In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 4352087 | Fume detector and alarm system A fume detector including a gas sensor having a heater element and a variable impedance element associated therewith whose impedance decreases in the presence of toxic gases or fumes, or a decrease of free oxygen in an atmosphere being monitored. A load r... | 09/28/1982 |
| 4350913 | Magnetic particle devices A housing for magnetic particle devices comprising first and second housing members adopted to be assembled in side-by-side axial relation, at least one of said housing members having an annular cavity formed extending inwardly on one side thereof adjacen... | 09/21/1982 |
| 4347993 | Tension monitor means and system A tension control system for use with a device which includes at least one roll over or around which a web or strand of material passes, a tension responsive transducer associated with the roll, a reference tension selector, a drive unit for effecting mov... | 09/07/1982 |
| 4152415 | Method of increasing the effectiveness of oral vaccination for swine dysentery The resistance of field-raised swine to dysentery infection is increased by a sequence of parenteral and oral administrations. First there is parenterally administered to the swine an injectable cell concentrate containing a virulent isolate of killed cel... | 05/01/1979 |
| 4152414 | Combination vaccine for swine dysentery and method of use A combination vaccine for increasing the resistance of swine to dysentery infection comprises killed cells of a virulent isolate of Treponema hyodysenteriae in combination with concentrated killed cells of Bacteroides vulgatus, or Fusobacterium necrophoru... | 05/01/1979 |
| 3985675 | Process for gelling aqueous polyol suspensions and resulting gel This invention relates to novel partially dehydrated amorphous calcium sodium pyrophosphate and to the production of such compounds. Also this invention relates to the process for the use of these compounds to gel aqueous solutions of some polyols and to ... | 10/12/1976 |
| 3976585 | Functional fluid compositions containing epoxide stabilizers Functional fluid compositions comprising a major amount of a base stock material which is an ester or amide of an acid phosphorus, a di- or tricarboxylic acid ester, an ester of a polyhydric compound or mixtures thereof, optionally minor amounts of other ... | 08/24/1976 |
| 3941709 | Functional fluid compositions containing epoxide stabilizers Functional fluid compositions comprising a major amount of a base stock material which is an ester or amide of an acid phosphorus, a di- or tricarboxylic acid ester, an ester of a polyhydric compound or mixtures thereof, optionally minor amounts of other ... | 03/02/1976 |
| 3939084 | Functional fluid compositions containing substituted pyrimidines Functional fluid compositions comprising polyphenyl thioethers, mixed polyphenyl oxy-thioethers and mixtures thereof containing certain pyrimidines as anti-corrosive agents have improved metal compatibility and are particularly useful as aircraft engine l... | 02/17/1976 |
| 3933669 | Functional fluid compositions Functional fluid compositions containing phosphate ester base stocks and hydrogenated quaterphenyls.... | 01/20/1976 |