Method for making a spill-proof lid

Details Method for making a spill-proof lid Method for making a spill-proof lid

2011-03-15

2011-03-15

Crispino, Richard (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

Reexamination Certificate

active

07906067

ABSTRACT:
Providing a drinking lid with an under-lap between a valve base and a lid body. The valve is created with an “L” shaped exterior step around the valve side wall adjacent the wall bottom. A coining die stamps the L-shaped step producing a smooth side wall and forcing excess plastic material under a die-cut at the wall bottom creating a flange which under-laps the lid body.

REFERENCES:
patent: 3860162 (1975-01-01), Schutz
patent: 3952910 (1976-04-01), Wheeler

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