Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7003919 | Post mount assembly A post and post mount assembly in a hole in the ground has a socket in the hole, concrete in the annular space between the interior walls of the hole and the exterior of the socket, a post in the socket, a wedge member having a tapered portion filling a gap between ... | 02/28/2006 |
| 6918827 | Universal chimney cap A chimney cap and a method for making the same are described. The chimney cap is more consistently and uniformly manufactured, which permits nesting. This is accomplished by forming the cap from single piece of expanded metal to create a substantially square or rect... | 07/19/2005 |
| 6471578 | Ventilator by force of nature with pressurization conduit hood A wind-powered ventilator includes a pressurization conduit hood mounted on the periphery of an automatic directional type or worm gear type ventilator. The conduit hood is arranged to pressurize atmospheric wind, however feeble and minimal, and conduct t... | 10/29/2002 |
| 4649808 | Fireplace damper assembly A damper assembly for sealing a vertical fireplace exhaust including a vertical duct having an outlet communicating with the atmosphere for exhaust of fireplace fumes, mounting means mounted on said vertical duct outlet, a damper downstream of said vertic... | 03/17/1987 |
| 4593610 | Automatic damper for chimney flue There is disclosed an automatic damper for a chimney flue, which maintains the chimney draft at an adjusted value despite varying wind velocity and direction. A vertical shaft is rotatably supported over the top outlet of the flue by a support secured to ... | 06/10/1986 |
| 4467960 | Combination weathervane heat exchanger A heat retrieving device is disclosed which directs cool incoming fresh air down a duct within a flue pipe. Hot gasses in the flue pipe heat the incoming air, warming it sufficiently so that it can be discharged directly into a room that is to be heated, ... | 08/28/1984 |
| 4373573 | Long term storage and use of solar energy A method and system for the passive solar energy induced storage and use of thermal energy at both high and low temperatures, comprising a collector (76,110) communicating with the atmosphere for collecting air acting as a carrier for thermal energy, an u... | 02/15/1983 |
