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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 |
| 4272558 | Method and apparatus for producing a cellular product A method and apparatus for producing a cellular product, such as cellular chocolate, in which the first component of the product, e.g. the chocolate, in liquid form, has introduced into it a second gaseous component which is largely soluble in the liquid ... | 06/09/1981 |
| 4269437 | Jointing of pipes A joint for jointing the ends of two pipes, particularly lined pipes, in which a radial resilient portion extends between the two ends of the pipes, two oppositely extending axial portions at the radial inner part of the radial portion each engage within ... | 05/26/1981 |
| 4231666 | Mixing apparatus A mixing device of the type having a housing of generally cylindrical construction, having an end wall with concentric arrays of axially extending mixing elements thereon, a rotor being rotatable within the housing and having on the face thereof further a... | 11/04/1980 |
| 4164375 | In-line mixer An in-line mixer for mixing fluids pumped along a tube, being a number of mixing elements inserted in series longitudinally along a tube, each mixing element comprising a plate member folded along at least one fold line to form at least two substantially ... | 08/14/1979 |
