In vertically integrating his packaging business Steven Wolfowitz, a chemical engineer, developed a plastic container and closure manufacturing facility producing about 2 million containers a month in 1984. Some bottles had handles and he noticed that the currently available flip open push-on caps were randomly applied to bottles. Sometimes when the caps were opened the top section which was hinged to the locating bottom section would obstruct the liquid being poured out which would be poured onto the open hinged top part.

He realized that most closures were usually completely removed without any retaining ring or lower section. But pilfer-proof caps were becoming important so he embarked upon designing and patenting a new pilfer-proof cap where the top section could be completely removed and relocated securely after use. This patented closure became the most widely used closure worldwide and became the de facto standard for all water, milk, medicine, fruit juices and carbonated PET drinks containers.

The novel and inventive claim involved the closure he made of two initially joined parts - the cover section and a retaining locating ring below separated by a thin perforated membrane which could be broken completely when upward pressure was applied to the to cover section. This upward pressure could be applied by either pushing up a small protruding lip connected to the top cover while the lower ring remained connected to a locating complementary ring on the bottle neck.

Obviously the patented upward pressure would also be exerted on a screw cap version when unscrewing the top cover section from the threads moulded above the retaining ring of the bottle neck.

To ensure there were no leaks the sealing of the bottle was achieved by an inner plug moulded into the top cover part of the closure. In the 'push-up' version a second locating peripheral protuberance at the lower end of the top part clipped onto a second higher retaining ring on the bottle neck to hold it closed after opening and use.

Unfortunately, due to circumstances beyond Steven's control, and without his knowledge, His patent maintenance renewals were not processed and Steven lost the patent and his rights.

Use of these closures is in the billions today.

His actual filed specification is displayed:



©2014 Steven Wolfowitz