The device is comprised of a vessel such as a drinking cup or a container...http://www.google.com/patents/US5810210?utm_source=gb-gplus-sharePatent US5810210 - Measured fluid pour method and deviceAdvanced Patent SearchPublication numberUS5810210 APublication typeGrantApplication numberUS 08/727,757Publication dateSep 22, 1998Filing dateOct 8, 1996Priority dateOct 8, 1996Fee statusLapsedPublicatio