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| Number | Title | Issue Date |
| 7313889 | Temporary ground-level road-edge member and method for positioning below-ground structures A template for temporary placement on the open upper end of a below-ground structure, including a rectangular body matching key dimensions of a permanent ground-level member to be installed, the body having an open bottom to engage the open upper end of the below-gr... | 01/01/2008 |
| 7128643 | Removable vent having a filter for use in a building foundation A removable ventilator is equipped to hold an air filter, the ventilator being designed for placement in a building foundation, for example between concrete blocks. The front of the ventilator faces away from the building when the ventilator is installed. The rear o... | 10/31/2006 |
| 6802769 | Air delivery unit, hose and deploying device therefor An expanding and retractably collapsing device includes a generally cylindrical hose which is expandable and retractably collapsible and has formed on a surface thereof a circumferentially extending rib. A roller assembly having rotatable framework is disposed adjac... | 10/12/2004 |
| 6743088 | Apparatus and method for minimizing liquid infiltration into subterranean openings Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repell... | 06/01/2004 |
| 6464425 | Apparatus and method for minimizing liquid infiltration into subterranean openings Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of w... | 10/15/2002 |
| 6379433 | Device for use in filtering contaminated air The present invention relates to a device for use in a manhole or similar structure, whereby the device is designed to filter contaminate gas typically found in such structure. More particularly, the device includes a canister member filled with filtratio... | 04/30/2002 |
| 6168514 | Apparatus for evacuating sewer gas from a sewer system An apparatus for evacuating sewer gas from a city sewer system comprises a frame that can be inserted into a manhole and supported by the surface surrounding the manhole, a gasoline engine carried by the frame, and a fan turned by the engine shaft so that... | 01/02/2001 |
| 5976007 | Security vent A security vent, providing a housing assembly mounted to a support, the housing assembly including a side wall portion having first and second distal ends thereof and defining a passageway therebetween; a drawer assembly having a filter-receiving slot the... | 11/02/1999 |
| 5337994 | Apparatus for mounting a portable ventilation fan to an access port An apparatus for mounting a portable ventilation fan at an access port in the wall of an enclosure. The apparatus comprises a fixable base plate having a first opening extending therethrough, and which is detachably mounted to the port with the first open... | 08/16/1994 |
| 5312295 | Subterranean transformer enclosure vent A heat venting system for subterranean transformer enclosures for sidewalks or streets includes a vent guard that passes air but prevents solids and fluids such as destructive oil from dropping upon the transformers. Used in connection with a vent plate h... | 05/17/1994 |
