Sealing fastener with multiple threads

Details Sealing fastener with multiple threads Sealing fastener with multiple threads

2005-02-15

2005-02-15

Wilson, Neill (Department: 3677)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Headed fastener element with nut, washer, securing means or cap

Headed bolt or screw with threads and complementary nut

C411S371100, C411S399000, C411S412000, C411S533000

Reexamination Certificate

active

06854942

ABSTRACT:
A screw having a primary thread extending along its shank and terminating at the screw head is formed with a supplemental thread extending between adjacent convolutions of the primary thread and also terminating at the head of the screw. The spaced termini of the two threads maintain a washer at the head in a position perpendicular to the axis of the shank of the screw.

REFERENCES:
patent: 3153971 (1964-10-01), Lovisek
patent: 3882752 (1975-05-01), Gutshall
patent: 5433570 (1995-07-01), Koppel
patent: 5779417 (1998-07-01), Barth et al.
patent: 6045312 (2000-04-01), Hsing

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