Hatch cover with pneumatic seal for mobile or stationary storage tanks

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Description

FIG. 1 is a perspective view of a hatch cover with pneumatic seal for mobile or stationary storage tanks showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D247848 May 9, 1978 Croyle
1342639 June 1920 Marcuse
1715328 May 1929 Joncha
2947453 August 1960 Parish, Jr. et al.
Patent History
Patent number: D271789
Type: Grant
Filed: Jun 2, 1981
Date of Patent: Dec 13, 1983
Assignee: Borg-Warner Chemicals, Inc. (Parkersburg, WV)
Inventors: Carl L. Hardee (Ottawa, IL), Robert E. Wagner (Ottawa, IL)
Primary Examiner: James M. Gandy
Attorney: Richard J. Schlott
Application Number: 6/269,928
Classifications
Current U.S. Class: D23/2; Body Element (D12/43); Element Or Attachment (5) (D12/317)
International Classification: D2301; D1203;