The broken lines in the drawings depict unclaimed environmental subject matter.
 
                 Patent Grant
 Patent Grant
                     D750144
 D750144
                    
    
    
    
    
    
    
    
    
The broken lines in the drawings depict unclaimed environmental subject matter.
| Number | Name | Date | Kind | 
|---|---|---|---|
| 2067230 | Bowers | Jan 1937 | A | 
| 2375657 | Jackson | May 1945 | A | 
| 2384999 | Heinrich | Sep 1945 | A | 
| 2386399 | Jackson | Oct 1945 | A | 
| 2401523 | Townsend | Jun 1946 | A | 
| 2404125 | Donnelly, Jr. | Jul 1946 | A | 
| 2415671 | Camilleri | Feb 1947 | A | 
| 2449370 | Donnelly | Sep 1948 | A | 
| 2477207 | Rinehart | Jul 1949 | A | 
| 2681969 | Burke | Jun 1954 | A | 
| 2692933 | Cornell | Oct 1954 | A | 
| 2799771 | Donnelly, Jr. | Jul 1957 | A | 
| 2899536 | Hoese et al. | Aug 1959 | A | 
| 3140386 | Cartwright | Jul 1964 | A | 
| 3356823 | Waters et al. | Dec 1967 | A | 
| 3659072 | Carkhuff et al. | Apr 1972 | A | 
| D417828 | Amin | Dec 1999 | S | 
| D419044 | Amin | Jan 2000 | S | 
| D419408 | Amin | Jan 2000 | S | 
| D419838 | Amin | Feb 2000 | S | 
| D422186 | Amin | Apr 2000 | S | 
| D424388 | Amin | May 2000 | S | 
| D615573 | Peters et al. | May 2010 | S |