| 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 |