Issued Patents 1989
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888925 | Fire-retardant fluid coupling assembly and method | — | 1989-12-26 |
| 4882886 | Automatically-releasable pipe attachment device | — | 1989-11-28 |
| 4877216 | Automatically-releasable pipe-attachment device | — | 1989-10-31 |
| 4858958 | Slip-joint coupling | — | 1989-08-22 |
| 4850385 | Fire stop pipe coupling adaptor | — | 1989-07-25 |
| 4848043 | Under floor fire stop coupling and method | — | 1989-07-18 |
| 4823527 | Plumbing concrete form accessory | — | 1989-04-25 |
| 4804160 | Automatically-releasable pipe-attachment device | — | 1989-02-14 |