Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 5446540 | Method of inspecting phase shift masks employing phase-error enhancing A phase-contrast microscope with a quarter-wave plate in a pupil plane with a thickness of λθ/2π is provided for the inspection of a phase-shifting mask. The angle θ and the wavelength λ are adjustable to optimize the phase detection sensitivity. A s... | 08/29/1995 |
| 5403682 | Alternating rim phase-shifting mask A phase-shifting mask consisting of phase shifting rim surrounding every pattern. The 0° and 180° areas defined by a straightforward rim phase-shifting mask are reversed alternately for closely packed patterns. This reversal can take the form of 0° to ... | 04/04/1995 |
| 5366757 | In situ resist control during spray and spin in vapor Spin coating of resist on a semiconductor wafer is done in a controlled chamber, starting with introducing a resist solvent vapor into the chamber from a nozzle, applying the resist by spraying a very thin layer of the resist material, monitoring and adju... | 11/22/1994 |
| 5272024 | Mask-structure and process to repair missing or unwanted phase-shifting elements A phase-shifting mask is composed of material including a substrate carrying a first phase-shifting layer having a phase-shift of .THETA., a second phase-shifting layer stacked upon the first layer having a phase-shift of (2π-.THETA.), and a third phase-... | 12/21/1993 |
