April 1939 Nonmetallic building materials Trademarks by day
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
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| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 | 29 |
Nonmetallic building materials Trademarks filed in April 1939
HYDRO-STONE
Filed: April 23, 1939
CASTING PLASTER COMPOSITION COMPRISING MAINLY CALCINED GYPSUM
Owned by: UNITED STATES GYMPSUM COMPANY
Serial Number: 71418798
SYNTHE-WOOD
Filed: April 10, 1939
CEMENTITIOUS MATERIAL CONSISTING OF WOOD IN PASTE FORM WHICH HARDENS WHEN EXPOSED TO AIR.
Owned by: AMBRAID COMPANY, INC.
Serial Number: 71418043
