Title: Non-spill drink-through lid

We claim:

1. A non-spill drink-through lid for use on a drinking cup comprising:

a lid having a central cover portion, said lid adapted to matingly engage the upper peripheral edge of a drinking cup so as to selectively maintain said lid in a covering relationship on said cup;

a tab portion defined in said central cover portion of said lid, said tab portion selectively depressible so as to provide a drinking opening in said lid, said tab portion biased so as to selectively return to its normally closed positon within the plane of said central cover portion upon removal of pressure thereagainst; and

a hollow lip-engaging buttress member integrally formed in said tab portion, said buttress member configured to provide increased heat-dissipating surfaces thereon so as to insulatively engage the upper lip of a user drinking from said cup through said drinking opening in said lid, said buttress member having a corrugated configuration comprising a plurality of arcuate narrow spaced-apart ridges having corresponding arcuate grooves positioned therebetween so as to insulatively engage the upper lip of a user drinking from said cup through said drinking opening in said lid, said ridges comprising narrow raised portions which define corresponding pockets on the bottom surfaces thereof so as to provide increased heat-dissipating surfaces on said buttress member so as to insulatively engage the upper lip of a user drinking from said cup through said drinking opening in said lid.

2. In the non-spill drink-through lid of claim 1 wherein said buttress member is selectively configured to extend across the bend line of said tab portion onto said central cover portion so as to enhance the biasing action acting to return said tab portion to its normally closed position within the plane of said central cover portion upon removal of pressure thereagainst.

3. In the non-spill drink-through lid of claim 1 wherein the lid is provided with a downwardly depending outwardly curved elongated annular skirt portion adapted to insulatively engage the lower lip of a user drinking from said cup through said drinking opening in said lid.


Other info:


Inventors: Dart, William A. (Okemos, MI)
Dart, Kenneth B. (Okemos, MI)

Application Number: 06/317789
Filing Date: 1981-11-04
Publication_date: 1983-11-01
Assignee: Dart, Container (US)

Primary Class(es): 220/711 220/254.100, 229/906.100
Other Classes: B65D43/10; A47G19/22
US Patent Ref:

3797696	March, 1974	Dirbell	220/90.4	NON-SPILL CONTAINER CLOSURE
3927794	December, 1975	Erdman	220/268	Container and cap with depressible section for drinking access
4056210	November, 1977	Boyle	220/904	Splash proof drink through beverage container lid
4106660	August, 1978	Boyle	Splash proof drink-through beverage container lid
4113135	October, 1978	Yamazaki	220/268	Drinking cup cover
4138033	February, 1979	Payne	220/90.4	Liquid container lid
4184604	January, 1980	Amberg	220/90.4	Drinking lid
4190174	February, 1980	Haimowitz	220/90.4	Drinking receptacle cover with a lip operated valve
4210256	July, 1980	Amberg et al.	220/90.4	Pour spout lid
4245752	January, 1981	Prueher	220/90.4	Lid for drinking container

Other Refs:
Primary Examiner: Lowrance, George E.
Assistant Examiner:
Attorney: Miller, Morriss & Pappas