Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9003733 | Standing seam strengthening apparatus | Harold G. Simpson | 2015-04-14 |
| 8091312 | Standing seam panel clips | Harold G. Simpson | 2012-01-10 |
| 7984596 | Roof assembly improvements providing increased load bearing | Harold G. Simpson | 2011-07-26 |
| 7730694 | Sliding clip with extended travel | Harold G. Simpson | 2010-06-08 |
| 6823642 | Roof demand and zone based roofing system | Harold G. Simpson, Clarence S. Salisbury | 2004-11-30 |
| 6588170 | Zone based roofing system | Harold G. Simpson, Clarence S. Salisbury | 2003-07-08 |
| 5737894 | Standing seam assembly | Harold G. Simpson | 1998-04-14 |
| 5303528 | Standing seam roof assembly and support apparatus | Harold G. Simpson | 1994-04-19 |
| 5142838 | Standing seam roof assembly and support apparatus | Harold G. Simpson | 1992-09-01 |
| 5038543 | Standing seam roof assembly | — | 1991-08-13 |
| 4682454 | Standing seam roof assembly components | Harold G. Simpson | 1987-07-28 |
| 4620397 | Roof system positionable over an existing roof structure and method for installing same | Harold G. Simpson | 1986-11-04 |
| 4534148 | Adjustable roofing support spacer apparatus and erection method | Harold G. Simpson | 1985-08-13 |
| 4528784 | Dual gutter assembly for prefabricated buildings | Harold G. Simpson | 1985-07-16 |
| 4520610 | Method for installing a roof system positionable over an existing roof structure | Harold G. Simpson | 1985-06-04 |