Patent ID: 8336744

Claim:
A device limiting fluid flow from a container having a threaded neck, said device avoiding fluid gushing from said container during pouring and ending fluid flow from said container without dripping after pouring, said device, comprising: a lower portion having a generally cylindrical shape, a semi-rigid membrane, substantially planar, spanning generally across said lower portion, said membrane having a centered round orifice, a first rib outwardly from said lower portion, internal threading adapted to attach said device to the threaded neck, and an intermediate surface generally outward from said membrane and generally perpendicular to said membrane; an upper portion having a generally planar cap, a hollow cylindrical wall beneath said cap, a second rib extending outwardly upon said wall and engaging said first rib and connecting said upper portion to said lower portion wherein said upper portion remains with said lower portion during usage, a round plunger centered in said upper portion and depending from said cap and including a truncated conical tip fitting into said orifice upon closing said upper portion upon said lower portion by rotation of said upper portion relative to said lower portion and by pushing said upper portion upon said lower portion, and said upper portion rotating coaxially upon said lower portion; said cap having an upper surface positioned outwardly and an opposite lower surface positioned inwardly; a pattern of spaced apart openings through said cap combining to provide less than the area of said orifice, said openings providing passage of fluid through said device without compression of the container; each of said openings having a generally truncated continuous conical shape, a narrow exit positioned outwardly of said cap and an opposite wider entrance positioned inwardly of said cap, each of said exits having a sharp crested edge condition in said upper surface, each of said entrances having a rounded edge condition in said lower surface, said rounded edge condition forming a lip upon the circumference of said entrance and extending radially inwardly into said opening, the truncated continuous conical shape extending from the rounded edge condition of said entrance to the sharp crested edge condition of said exit; and, said device having a closed position with said upper portion adjacent to said lower portion and an opened position with said upper portion away from said lower portion; wherein said device is adapted to allow a user to operate said device using one hand.