Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5647570 | Vacuum cleaner motor mounting apparatus | Robert C. Berfield | 1997-07-15 |
| D349791 | Wheeled type suction producing unit for vacuum cleaner | Robert C. Berfield | 1994-08-16 |
| D349436 | Hedge trimmer housing | John M. Griffin | 1994-08-09 |
| D344616 | Tool caddy for tank type vaccum cleaner | Robert C. Berfield | 1994-02-22 |
| D341008 | Wheeled tank for a pressure washer | Robert C. Berfield, Craig A. Seasholtz | 1993-11-02 |
| D341009 | Large tank for a pressure washer | Robert C. Berfield, Craig A. Seasholtz | 1993-11-02 |
| D340556 | Tank for a pressure washer | Robert C. Berfield, Craig A. Seasholtz | 1993-10-19 |
| D334615 | Sprayer | Robert C. Berfield, Craig A. Seasholtz | 1993-04-06 |
| 5079796 | Nozzle assembly for a vacuum device | Robert C. Berfield | 1992-01-14 |
| D315235 | Housing for vacuum cleaner motor | Robert C. Berfield | 1991-03-05 |
| 4984330 | Nozzle assembly for a vacuum device | Robert C. Berfield | 1991-01-15 |
| D311615 | Vacuum cleaner nozzle | Robert C. Berfield | 1990-10-23 |
| 4938421 | Cleaning liquid mixer for a water line, particularly for a surface cleaner | Robert C. Berfield | 1990-07-03 |
| D305816 | Portable blower | Robert C. Berfield, Craig A. Seasholtz | 1990-01-30 |
| 4880364 | Portable electric blower | Robert C. Berfield, Craig A. Seasholtz | 1989-11-14 |
| 4858271 | Wheel type vacuum cleaner | Robert C. Berfield | 1989-08-22 |
| 4836753 | Portable electric blower | Robert C. Berfield, Craig A. Seasholtz | 1989-06-06 |
| 4797072 | Portable electric blower | Robert C. Berfield, Craig A. Seasholtz | 1989-01-10 |
| 4683608 | Alternate blower outlet for vacuum cleaner | Robert C. Berfield | 1987-08-04 |
| D290055 | Sweeper | Robert C. Berfield, R. Lent Crevling, Jr., Richard M. Fegan | 1987-05-26 |
| 4658458 | Rotary brush sweeper with mechanism for brush height adjustment | Robert C. Berfield, R. Lent Crevling, Jr., Richard M. Fegan | 1987-04-21 |
| D287895 | Motor housing for canister type electric vacuum cleaner | Robert C. Berfield, Robert L. Crevling, Jr. | 1987-01-20 |
| D287658 | Motor housing for canister type electric vacuum cleaner | Robert C. Berfield, Robert L. Crevling, Jr. | 1987-01-06 |
| D287171 | Motor housing for canister type electric vacuum cleaner | Robert C. Berfield, Robert L. Crevling, Jr. | 1986-12-09 |
| 4538971 | Assembly of tank lid and fan means of a wet/dry vacuum | Jonathan Miller, Rudolph W. Wacek, Robert C. Berfield, Robert L. Crevling, Jr., Lonnie B. Lawson, Jr. | 1985-09-03 |