Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7331150 | Shingle with interlocking water diverter tabs A shingle includes a body having a top surface, a bottom surface, an upper end, a lower end, a first side, and a second side. The body has a width defined as the distance between the first and second sides and a length defined by the distance between the upper and l... | 02/19/2008 |
| 6725618 | Siding and overhang attachment system A siding attachment strip and method are provided for retaining a plurality of siding panels to a building structure. The siding attachment strip includes an elongate body, one or more mounting holes, and a plurality of siding top edge clips spaced along the elongat... | 04/27/2004 |
| 6653404 | Rubber compositions A rubber composition having satisfactory processability and dimension stability, exhibits excellent tensile strength and wearing resistance when vulcanized and comprises (1) a crosslinked rubber particle containing as repeating units (a) 39.89 to 79.89% b... | 11/25/2003 |
| 6336303 | Injection molded exterior siding panel with positioning relief and method of installation A siding panel and two methods of installing a wall covering made from injection molded materials and having positioning relief to facilitate installation. The siding panel includes a plurality of decorative elements formed with a top edge disposed above ... | 01/08/2002 |
| 6212842 | Roof cover element A preformed roof cover element consisting essentially of a quadrilateral panel (1) with the shape of an isosceles trapezium whereof the two non-parallel sides (2 and 3) have rims (4 and 5) extending substantially over the whole length of the sides. The ri... | 04/10/2001 |
| 5860263 | Thickened reinforced roofing shingle This invention relates to a rectangular roofing shingle defined as a shingle unit having front and rear stepped edges and having (a) an undivided headlap portion and (b) a butt portion horizontally divided into at least 4 dissimilarly shaped, space-separa... | 01/19/1999 |
| 5784848 | Roofing system and shingle A roofing system and shingle for a roof having sides and an apex is provided. A stripping is attached to the roof near the apex of the roof. A first shingle is attached to the stripping. A panel has a top edge, a bottom edge, a first side edge and a secon... | 07/28/1998 |
| 5752355 | Tongue and groove multiple step panel Sheet metal multiple stepped tile panels are joined to similar roof panels in interlocking relationship. On one edge running the length of the panel is a single female groove while the opposite edge of the panel has a plurality of male members which can e... | 05/19/1998 |
| 5661940 | Heat shield shingle The present invention provides a shingle for covering a roof or other surface. The shingle has an integral heat shield for shielding the roof from direct solar radiation. The shingle is substantially L-shaped when viewed from above and comprises two main ... | 09/02/1997 |
| 5022207 | Building panel having locking flange and locking receptacle A building panel useful as vinyl soffit in residential construction. The building panel comprises a principal portion, a locking flange, and a locking receptacle interlocking with the locking flange of an adjacent panel. The building panel is easy to asse... | 06/11/1991 |
| 5001879 | Building insulation A piece of insulation has a body of insulating material and a vapor barrier sheet adhered to the body of insulating material. The vapor barrier sheet has a first tab extending beyond the body of insulating material. The vapor barrier sheet has a portion n... | 03/26/1991 |
| 4729202 | Roofing tile A roofing tile comprises a rectangular panel having first and second longitudinal edge portions adapted to extend in the slope direction of a sloped roof and an upper lateral edge and a lower lateral edge is adapted to run parallel to the horizontal edges... | 03/08/1988 |
