Hermetically sealed devices for leak detection

• US 5,452,661 A
• Filed: 06/15/1994
• Issued: 09/26/1995
• Est. Priority Date: 06/15/1992
• Status: Expired due to Term

• Current Assignee: Chartech Engineering Inc.
• Original Assignee: George R. Neff
• Inventors: Neff, George R.
• Primary Examiner(s): JOHNSON, STEPHEN
• Application Number:
  US08/260,071
• Time in Patent Office: 468 Days
• Field of Search: 102/20 2.5, 102/202.6, 102/202.7, 102/202.8, 102/202.9, 102/202.11, 102/202.12, 102/202.13, 102/202.14
• US Class Current: 102/202.7
• CPC Class Codes: F42B 3/16 Pyrotechnic delay initiators F42B3/195 takes precedence; programmable electronic delay initiators F42C11/065
• CPC Class Codes: F42B 3/195 Manufacture
• CPC Class Codes: F42B 33/00 Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor F42B5/188 takes precedence; manufacturing processes for hollow charges F42B1/036; manufacture of blasting cartridge initiators F42B3/195
• CPC Class Codes: F42B 35/00 Testing or checking of ammunition apparatus for measuring the energy of projectiles G01L5/14

Abstract

A method of providing a gas-gettering medium within hermetically sealed devices which allows small cavity devices to be leak tested to verify their seal integrity. The gettering medium utilizes forms of charcoal, including activated carbon materials. A hermetically sealed device with the charcoal incorporated therein, as in an otherwise normal void in the device, or mixed with a charge of explosive in the device.

Claims

1. A device having a container including at least two members, all said members being hermetically sealed together so that when properly assembled the hermetically sealed container will not pass a test tracer gas from the exterior of the container to the interior of the container,

a quantity of coconut shell charcoal incorporated within said container before said sealing, said coconut shell charcoal being capable of gettering and retaining said test tracer gas leaking into said container during testing under external gas pressure for leakage of said hermetic seal prior to use of the device, and

a charge of explosive, an igniter wire for said charge, and electrical conductors for connecting said igniter wire to an external power source, said charge, igniter wire and conductors being within said hermetically sealed container, and with said quantity of coconut shell charcoal disposed about said igniter wire, for leakage testing prior to igniting said explosive charge.

2. A device as defined in claim 1 with said container members providing a charcoal zone within said container, and with said quantity of charcoal disposed in said charcoal zone.

3. A device having a container including at least two members, all said members being hermetically sealed together so that when properly assembled the hermetically sealed container will not pass a test tracer gas from the exterior of the container to the interior of the container, and

a quantity of coconut shell charcoal, a charge of explosive, an igniter wire for said charge, and electrical conductors for connecting said igniter wire to an external power source, said charcoal, charge, igniter wire and conductors being incorporated within said container before said sealing, with said quantity of coconut shell charcoal disposed about said igniter wire said coconut shell charcoal being capable of gettering and retaining said test tracer gas which could leak into said container during testing for said hermetic seal of said container by subjection to external tracer gas pressure prior to igniting said explosive charge.