Process for sealing a cover over a vault

Details Process for sealing a cover over a vault Process for sealing a cover over a vault

1990-06-27

1992-03-03

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264275, 264278, 264314, B29C 6722

Patent

active

050930559

ABSTRACT:
A process and resulting structure providing a utility vault with a foam-filled tube sealing the space between the vault walls and the vault cover. Preferably the tube includes an inner tube that is sufficiently porous to permit gas to flow therethrough but only a small amount of uncured foam to flow therethrough, and a plastic outer tube that prevents the foam from bonding to the vault structure.

REFERENCES:
patent: 3431331 (1969-03-01), Pincus et al.
patent: 3962394 (1976-06-01), Hall
patent: 4092296 (1978-05-01), Skiff
patent: 4232788 (1980-11-01), Roth
patent: 4269890 (1981-05-01), Breitling et al.
patent: 4390333 (1983-06-01), Dubois
patent: 4773792 (1988-09-01), Landers
patent: 4821399 (1989-04-01), Markley et al.

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