Anti-spill lid for beverage container
US4756440A · kind A · utility
96Cited by
21References
10Claims
0Family size
Inventor
Key dates
| Filing date | Sep 14, 1987 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Sep 14, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2543/00555
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An anti-spill drinking cup lid flexes inwardly, without the use of a vent hole, responsive to drinking suction applied by the cup user. The flexing is by means of a central raised portion of the lid, separated by a flex line from radiating ribs which separate slightly to enlarge the cup lid diameter when liquid is withdrawn through a raised drinking spout provided with apertures sized to prevent passage of liquid. The apertures are located in a valley in the spout end to prevent splash leakage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.