US 7,320,346 B2
Method of proof testing glass
Toby King, Palo Alto, Calif. (US); Paul Stuart Bridges, Menlo Park, Calif. (US); and Oliver Shergold, Cottenham (United Kingdom)
Assigned to Zogenix, Inc., Emeryville, Calif. (US)
Filed on May 01, 2007, as Appl. No. 11/743,055.
Application 11/743055 is a continuation of application No. 10/539964, granted, now 7,231,945, previously published as PCT/US03/40587, filed on Dec. 18, 2003.
Claims priority of application No. 0229447.8 (GB), filed on Dec. 18, 2002.
Prior Publication US 2007/0193338 A1, Aug. 23, 2007
Int. Cl. B65B 1/04 (2006.01)
U.S. Cl. 141—83  [73/37; 73/52] 22 Claims
OG exemplary drawing
 
1. A method of testing the strength of a glass container, comprising:
pressurizing the container, the container failing the test if it breaks;
wherein the container is pressurized to be subjected to a pressure profile which in a first stage increases from a starting pressure to a peak pressure at a first average rate of pressure increase; and
wherein in a second stage decreases from the peak pressure to the starting pressure at a second average rate of pressure decrease which is greater than the first average rate of pressure increase.