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| Number | Title | Issue Date |
| 4279356 | Quick opening manhole cover assembly A quick opening manhole cover including a clamping flange (16) which captures the ears (48) of a locking ring (46) upon rotation of the locking ring with respect to a manhole cover (40). The manhole cover has an O.D. less than the I.D. of the manhole for ... | 07/21/1981 |
| 4266380 | High strength cover for underground utility box A high strength cover for an underground utility box of the type that is normally installed on streets and driveways and is subjected to substantial vehicle loads. The cover structure includes a fixed rectangular frame the upper edge of which is installed... | 05/12/1981 |
| 4248546 | Manhole ceiling tent A manhole tent including a substantially planar sheet-like portion for placement in contiguous relationship to the ceiling of a manhole, an opening in the sheet-like portion, a chimney attached to the sheet-like portion and leading to the opening for perm... | 02/03/1981 |
| 4237666 | Trimless flush floor fitting A trimless flush floor fitting for positioning at an opening in a floor or other structural member, at a level line of said structural member, the fitting comprising a leveling frame member and linkage members complementarily adjustably connecting the fra... | 12/09/1980 |
| 4203686 | Manhole construction A liquid-tight manhole closure structure including a base frame having a manhole opening therein, a manhole cover for placement in the manhole opening, and a retainer ring for detachably securing the cover on the frame. The retainer ring and frame having ... | 05/20/1980 |
| 4192625 | Precast concrete catch basin with form for gutter inlet A precast concrete catch basin is provided with an integral transverse gutter inlet shaping form across the front. The form is spaced from the top slab of the catch basin and forms therewith a gutter inlet for the passage of water into the catch basin. Th... | 03/11/1980 |
| 4188151 | Manhole extension assembly Plastic extender rings for manholes are produced and are seated on the top ring of a manhole by the use of caulking or other adhesive material. The manhole cover, which is elevated by the plastic ring or rings from the old pavement level to a new pavement... | 02/12/1980 |
| 4145151 | Manhole cover and frame work A method for inhibiting movement between a load bearing access device, such as a manhole cover or catch basin grate and its supporting framework which involves drilling a plurality of vertical passageways at spaced apart intervals adjacent to the circumfe... | 03/20/1979 |
| 4143989 | Adjustable brace An adjustable brace for securing the cap portion of a catch basin used in sewer systems to enable such cap portions to remain in place during continuous pouring of curb and gutter.... | 03/13/1979 |
| 4136010 | Catch basin interceptor A catch basin may be retrofit for isolating/diverting spills and/or initial storm runoff for the subsequent treatment or recycling of the collected material. A sloping, peripheral trough is provided in the catch basin and is connected to one or more stora... | 01/23/1979 |
| 4124324 | Modular cable trench system A modular cable trench system for receiving cable in a trench excavated in the earth. The system includes one or more tee and/or channel elements of lightweight modular construction, with each of the molded modular units including a bottom frame and oppos... | 11/07/1978 |
| 4123184 | Underground fire hydrant frame and cover A frame and cover for an underground fire hydrant, especially adapted for use in locating a fire hydrant in a highway, preferably at an intersection, and by means of which the fire hydrant is rendered readily accessible for use.... | 10/31/1978 |
| 4120919 | Quick opening removable tray sections for fluid contact Novel quick opening removable tray sections or deck plates for trays of fluid contact vessels having foldable closures or covers adapted to rest upon frame members which coact to form perimeters of one or more polygonal, preferably quadrangular, complemen... | 10/17/1978 |
| 4109425 | Circular type manholes A manhole well structure for gaining access to an underground water main, a sewer pipe system or the like, which includes a preferably precast base, made of concrete or like material, which is disposed at an appropriate depth below the ground level. The b... | 08/29/1978 |
| 4101236 | Sealing manhole cover for use on existing unsealed sanitary sewer manhole cover frames A manhole cover having no openings is provided with a blind pocket for insertion of a lifting tool and has a rectangular O-ring groove in the lower surface to receive a circular O-ring. The groove is so located as to cause the O-ring to engage the flat be... | 07/18/1978 |
| 4101154 | Locking device for well covers and the like The disclosure relates to a device for locking the lids or covers of wells and similar constructions, a locking mechanism which is actuable from the outside being disposed on the underside of the cover. The novel feature of the invention is that the locking de... | 07/18/1978 |
| 4067659 | Manhole closure assembly Manhole closure assembly for preventing storm water from entering into manhole opening comprises cover section including downwardly depressed central portion. Circular mounting flange extends outwardly from depressed central portion and flange is adapted ... | 01/10/1978 |
| 4030851 | Manhole closure including a two-way pressure relief valve A manhole closure for diverting liquid away from a sewer system that is readily installable in a conventional manhole opening beneath a manhole cover, the device including two-way pressure relief valves to compensate for increased or decreased system pres... | 06/21/1977 |
| 4029425 | Manhole extension This invention relates to an improved manhole extension or shield of the type constituting the subject matter of my U.S. Pat. No. 3,294,000 which improvement comprises providing at least one, and preferably both of the outwardly-facing channels with a cir... | 06/14/1977 |
| 4021131 | Cover assembly A cover assembly for enclosing a utility unit having a housing forming a chamber and having an open bottom. The chamber is of a size to accommodate the utility unit. An articulated connecting structure having two hinges secures the housing to a support, a... | 05/03/1977 |
| 4015373 | Manhole assembly with removable cover, especially for a carriageway A flat outer frame is provided with an edge-section for receiving a single-piece manhole cover which has three projections located at the apices of a triangle and adapted to rest on the edge-section so as to form a horizontal bearing triangle. Means are p... | 04/05/1977 |
| 4013374 | Cover for manhole structures A cover for manhole structures embodying a metal portion constructed of high strength material and assembled to provide maximum strength with a minimum of weight. A concrete portion is carried by the metal portion with the weight of the concrete portion b... | 03/22/1977 |
| 4000953 | Concrete catch basin with spring retained manhole cover A pre-cast concrete catch basin has a metal manhole cover removably disposed in a seat formed in its top slab. A spring biased latch retains the cover in position, the latch engaging a catch extending from the lower surface of the top slab.... | 01/04/1977 |
| 3999335 | Access cover and cleat connection therefore An access cover frame for an underground station such as a pumping station is provided with a cleat connection for assembling a plurality of access covers to accommodate various size stations. The access cover frames are formed of members having a base an... | 12/28/1976 |
| 3975870 | Floor hatch A floor hatch including an outer framework adapted to be installed in a floor of a building and having an abutment face at the upper end of the inner surface of the framework and a cover assembly fitted in the outer framework, said cover assembly includin... | 08/24/1976 |
| 3973856 | Manhole closure assembly A manhole closure assembly primarily for preventing drainage and storm water from emptying into a manhole leading to a sewage system. The closure assembly includes a retaining ring secured within a manhole opening, and a removable closure plate seated wit... | 08/10/1976 |
| 3969847 | Combination manhole closure assembly and separate support ring Combination includes manhole closure assembly for preventing storm water from entering into manhole opening and separate support ring for assembly. Support ring has lower closure supporting flange with upper flange spaced therefrom, and sealing material i... | 07/20/1976 |
| 3930739 | Manhole frame with adjustment screws A manhole frame with adjustment screws for raising and lowering said frame has in its inner surface pockets or recesses each communicating with a hole for guiding of the adjustment screws. The recesses serve to receive nuts for the screws and the recesses... | 01/06/1976 |
