Spherical spirit level
Description
FIG. 1 is a top plan view of a spherical spirit level showing our new design;
FIG. 2 is a left end elevational view thereof the right end being a mirror image thereto;
FIG. 3 is a bottom and side perspective view thereof, the opposite side being identical thereto.
The opposite side and opposite end are identical respectively to the side and end shown in FIG. 3.
Referenced Cited
U.S. Patent Documents
| 812251 | February 1906 | Alexander |
| 949842 | February 1910 | Pugh |
| 970360 | September 1910 | Whigham |
| 1277748 | September 1918 | Owen |
| 1479024 | January 1924 | Booraem |
| 2645030 | July 1953 | Mahone |
| 2767483 | October 1956 | Sauer |
Patent History
Patent number: D243931
Type: Grant
Filed: Aug 7, 1975
Date of Patent: Apr 5, 1977
Inventors: Richard A. Pitkin (Burbank, CA), Stanley T. Beale (Burbank, CA)
Primary Examiner: Nelson C. Holtje
Attorney: Vernon D. Beehler
Application Number: 5/602,548
Type: Grant
Filed: Aug 7, 1975
Date of Patent: Apr 5, 1977
Inventors: Richard A. Pitkin (Burbank, CA), Stanley T. Beale (Burbank, CA)
Primary Examiner: Nelson C. Holtje
Attorney: Vernon D. Beehler
Application Number: 5/602,548
Classifications
