Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11365824 | Adjustable fail-safe rotary spring operator with a retaining band | Frederick Rand Underwood, III | 2022-06-21 |
| 10228073 | Adjustable fail-safe rotary spring operator with a retaining band | Frederick Rand Underwood, Jr., Frederick Rand Underwood, III | 2019-03-12 |
| 10145489 | Adjustable fail-safe rotary spring operator with a retaining band | Frederick Rand Underwood, Jr., Frederick Rand Underwood, III | 2018-12-04 |
| 9151351 | Adjustable fail-safe rotary spring operator with a retaining band | Frederick Rand Underwood, Jr., Frederick Rand Underwood, III | 2015-10-06 |
| D608266 | Side discharge muffler | — | 2010-01-19 |
| 6510921 | Muffler/exhaust extractor | — | 2003-01-28 |
| D371824 | Floating adjustable pool chlorinator | Michael L. Schuman | 1996-07-16 |
| 5476116 | Floating adjustable pool chlorinator | Michael L. Schuman | 1995-12-19 |
| 5338446 | Filter unit for in-line use in a pool vacuum hose | Michael L. Schuman | 1994-08-16 |
| D279227 | Combined filter and vacuum head for cleaning underwater surfaces | — | 1985-06-11 |
| 4459859 | Flowmeter | Michael L. Schuman | 1984-07-17 |
| D271816 | Vacuum head for cleaning underwater surfaces | — | 1983-12-13 |
| 4293425 | Method of chlorinating swimming pools and the like | — | 1981-10-06 |
| D259936 | Swimming pool vacuum head | Isao Sasaki | 1981-07-21 |
| 4210624 | Universal chlorinator module | — | 1980-07-01 |