Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4413457 | Checkered wall or ceiling system A suspension ceiling or wall system is disclosed providing a plurality of spaced, rectangular pans or projections positioned in spaced relationship in a pattern to provide a ceiling or wall surface with the appearance of a plurality of such pans suspended... | 11/08/1983 |
| 4287683 | Solar shield A solar shield for room windows reflects and dissipates solar energy by means of a reflective surface and backing piece between which is defined a warm air channel. The backing piece is positioned away from the window surface so that sunlight is admitted ... | 09/08/1981 |
| 4233795 | Field repair roof panel for a railway car A replacement roof panel for repairing damaged railway car roofs in the field. The damaged portion is cut away leaving an opening in the roof. The repair panel is fabricated to the desired width and has reinforcing end portions that form laterally extendi... | 11/18/1980 |
| 4143499 | Roofing sheet A corrugated roofing sheet has special elevations formed in the wave crest of the sheet, the elevations being contoured to increase the sheet's rigidity while permitting the elevations to function as a ladder. The elevations provide effective rigidfying w... | 03/13/1979 |
| 3994693 | Expandable metal membrane An expandable metal membrane of the type used to contain cryogenic liquids is disclosed. The membrane utilizes two sets of triangular shaped corrugations at right angles to each other. The corrugations are arranged so that the membrane expands only along ... | 11/30/1976 |
