Helically wound lock-seam tube

- Protol A.G.
Skip to: Description  ·  References Cited  · Patent History  ·  Patent History
Description

FIG. 1 is a perspective view of a helically wound lock-seam tube, showing my new design as seen obliquely from the side; and,

FIG. 2 is an end view of the helically wound lock-seam tube.

Referenced Cited
U.S. Patent Documents
192079 June 1877 Noble
D213828 April 1969 Blake
224228 February 1880 Ritchie
D296355 June 21, 1988 Kanao
470738 March 1892 Bayles
683519 October 1901 Taylor
2888043 May 1959 Reid
4706481 November 17, 1987 Castricum
Foreign Patent Documents
1168179 October 1969 GBX
1212221 November 1970 GBX
2213748 August 1989 GBX
WO8600123 March 1986 WOX
WO8911351 August 1989 WOX
Other references
  • Pamphlet entitled "The Round Revolution" .COPYRGT.1993 Spiro International S.A., Switzerland.
Patent History
Patent number: D376193
Type: Grant
Filed: Mar 8, 1995
Date of Patent: Dec 3, 1996
Assignee: Protol A.G. (Glarus)
Inventor: Kenneth Lennartsson (Torekov)
Primary Examiner: Doris V. Coles
Assistant Examiner: Gregory Andoll
Law Firm: Weingarten, Schurgin, Gagnebin & Hayes LLP
Application Number: 0/35,875
Classifications
Current U.S. Class: Pipe, Tubing Or Hose (D23/266)