Issued Patents All Time
Showing 51–69 of 69 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D341009 | Large tank for a pressure washer | Robert C. Berfield, Ronald F. Meland | 1993-11-02 |
| D340556 | Tank for a pressure washer | Robert C. Berfield, Ronald F. Meland | 1993-10-19 |
| D337368 | Tank for a pressure washer | Robert C. Berfield | 1993-07-13 |
| D334972 | Pressure spray washer | Robert C. Berfield | 1993-04-20 |
| D334615 | Sprayer | Robert C. Berfield, Ronald F. Meland | 1993-04-06 |
| RE34130 | Dolly frame | Robert C. Berfield | 1992-11-24 |
| 5069391 | Dual-activator safety switch for liquid sprayer | — | 1991-12-03 |
| D314457 | Basket for a sweeper, or the like | Robert C. Berfield | 1991-02-05 |
| D310746 | Dolly | Robert C. Berfield | 1990-09-18 |
| D305816 | Portable blower | Robert C. Berfield, Ronald F. Meland | 1990-01-30 |
| 4880364 | Portable electric blower | Robert C. Berfield, Ronald F. Meland | 1989-11-14 |
| 4836753 | Portable electric blower | Robert C. Berfield, Ronald F. Meland | 1989-06-06 |
| 4799699 | Dolly frame | Robert C. Berfield | 1989-01-24 |
| 4797072 | Portable electric blower | Robert C. Berfield, Ronald F. Meland | 1989-01-10 |
| D294879 | Housing for a vacuum cleaner motor | Robert C. Berfield | 1988-03-22 |
| 4709436 | Debris pan for rotary brush sweeper | Robert C. Berfield, Richard M. Fegan | 1987-12-01 |
| 4701969 | Rotary brush sweeper with easily separable debris pan | Robert C. Berfield, Richard M. Fegan | 1987-10-27 |
| D289933 | Sweeper | Robert C. Berfield, Richard M. Fegan | 1987-05-19 |
| 4623366 | Grid element for lid of a cannister type vacuum cleaner | Robert C. Berfield, Rudolph W. Wacek | 1986-11-18 |