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Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7222803 | Liquid dispensing apparatus A hand operated flexible bulb for use with a liquid dipensing apparatus 5, the bulb comprises an open ended neck 2 which is securable in an air tight manner to a liquid dispensing apparatus. The flexible bulb is provided with an air inlet 6 sepa... | 05/29/2007 |
| 7025092 | Positive air pressure attenuation device for drainage systems The positive air pressure attenuation device (1) for use in drainage systems in buildings includes a housing (3), connected to the system, to which a flexible reservoir (10) is secured, the flexible reservoir (10) being operable on a posi... | 04/11/2006 |
| 5983929 | Air valve An air valve that comprises a concave, downwardly facing cover (4) which is carried by a pipe connector (1) connected generally coaxially thereto, wherein the upper edge-part of the pipe connector (1) is surrounded by the wall of the cover (4), a ring-sha... | 11/16/1999 |
| 5197510 | Apparatus for checking back pressure Apparatus for monitoring gas pressure in a drain line including a housing, a liquid trap within the housing interior, a liquid collector for collecting liquid displaced from the trap when gas pressure in the drain line exceeds a predetermined level, and a... | 03/30/1993 |
| 4991623 | Automatic air valves for ducts An automatic air valve for a conduit, through which passes fluids and/or solids, which valve prevents the discharge of contaminated air therefrom into the environment and which further permits the introduction of fresh air from the environment into the co... | 02/12/1991 |
| 4962548 | Valve assembly A plumbing arrangement is described for a toilet pan connected to a waste disposal pipe. The waste pipe has an extension extending a short height above the flood level of the water trap. The upper end of the extension is closed off by a two way differenti... | 10/16/1990 |
| 4811753 | Recreational vehicle drain vent A drain vent apparatus for recreational vehicles may be coupled to the drain vent of a drain line of a vehicle and includes a coupling for a drain hose for the output of the drain vent. The drain vent has an outer housing and an inner pipe located in said... | 03/14/1989 |
| 4637080 | Air volume control Disclosed is an air volume control for use with a flowing water line to control the quantity of air sucked by venturi action into the water line. The air volume control comprises a tubular valve body with a common member defining co-axial oppositely direc... | 01/20/1987 |
| 4545398 | Venting device A venting device for sanitary conduits comprising a first edge 12 and a second edge 10 bounding an air passage 7. One side of a valve 8 of flexible material is retained on the upper side of first edge 12, the other side provided with a downwardly extendin... | 10/08/1985 |
| 4524795 | Hydraulic device for the drainage of waste water The present invention relates to a waste water outlet for a sanitary plant, comprising a siphon forming a water seal to which is connected a waste pipe for connection with sewers and in which an automatic air valve device and a siphon are combined in one ... | 06/25/1985 |
| 4232706 | Automatic valve device for sanitation waste pipes The invention relates to an automatic air valve device for sanitation waste pipes for preventing communication in the rooms between the waste pipes and atmosphere and to permit the introduction of fresh air into the pipes when a negative pressure occurs. ... | 11/11/1980 |
| 4212314 | Waste water outlet sanitary plant comprising a siphon The present invention relates to a waste water outlet sanitary plant comprising a siphon forming a water seal to which is connected a waste pipe for connection with sewers and in which an automatic air valve device and a siphon are combined in one single ... | 07/15/1980 |
| 4185654 | Anti-siphoning device for venting drain lines The anti-siphoning device includes a T-shaped valve body having a downwardly facing opening, an upwardly facing opening and a laterally facing opening. Constrained for vertical movement within the valve body is a hollow cylindrical float valve having a cl... | 01/29/1980 |
