| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 28 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Textiles and paper | |
| #4 | Materials and metallurgy | |
| #5 | Thermal processes |
| # | Technology | |
|---|---|---|
| #1 | Roof coverings | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Building materials | |
| #5 | Paper goods | |
| #6 | Structural elements | |
| #7 | Shaping clay | |
| #8 | Furnaces | |
| #9 | Details of furnaces | |
| #10 | Paper-making machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Harshberger Norman P | 32 |
| Publication | Filing date | Title |
|---|---|---|
| US3307989A | Roofing product and method of application | |
| US3137614A | Containers | |
| US2913363A | Method of forming reinforced pulp sheets | |
| US2958623A | Method of molding a low density high strength shaped body from a dilute slurry | |
| US3137100A | Roofing product | |
| US2722868A | Apparatus for manufacturing a composition material | |
| US2630310A | Apparatus for processing fusible materials | |
| US1885346A | Shingle element | |
| US1862852A | Roofing and siding element | |
| US1892146A | Electrical wiring system | |
| US1894037A | Shingle machine | |
| US1756743A | Roofing material | |
| US1759901A | Composition shingle | |
| US1889121A | Composition shingle | |
| US1717603A | Composition shingle | |
| US1666204A | Shingle | |
| US1718933A | Shingle | |
| US1729830A | Shingle | |
| US1641427A | Shingle | |
| US1671424A | Shingle |