Bizarre Patents
Pillow with retractable umbrella
A pillow assembly having a supporting assembly and a retractable umbrella assembly that is easily transportable and allows a user to support his/her head while covering their face from sunlight.
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| Number | Title | Issue Date |
| 3938058 | Tunable laser A tunable laser is disclosed in which a plurality of laser beams different from one another in wavelength and polarization can be simultaneously oscillated. The tunable laser is advantageous among others in that an atomic absorption spectroscopic analysis... | 02/10/1976 |
| 3936770 | Single laser cavity for generating TE or TM modes A dye laser, pumped by a nitrogen laser, has been made to operate in both the TE01 and TM01 rotationally symmetric modes, regardless of the variation in laser wavelength. By changing the spacing of lenses within the optical cavity, t... | 02/03/1976 |
| 3934210 | Tuning apparatus for an optical oscillator One or more birefringent plates are placed within the optical cavity of an optical oscillator such as a dye laser. Each of the plates is positioned at an angle, such as Brewster's angle with respect to the light reflected within the optical cavity of the ... | 01/20/1976 |
