| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Packaging and shipping | |
| #3 | Textiles and paper | |
| #4 | Machines | |
| #5 | Furniture and games |
| # | Technology | |
|---|---|---|
| #1 | Construction of roads | |
| #2 | Platform constructions | |
| #3 | Milling | |
| #4 | Transport or storage devices | |
| #5 | Machines for making railways | |
| #6 | Woven fabrics | |
| #7 | Kitchen equipment |
| # | Name | Total Patents |
|---|---|---|
| #1 | Heltzel Francis O | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US2929311A | Rotisserie barbecue device | |
| US2543966A | Road surface checking and grooving machine | |
| US2476243A | Expansion pocket for dowel bars | |
| US2309767A | Transverse expansion and contraction joint | |
| US2263677A | Dowel for concrete roads | |
| US2091925A | Guardrail | |
| US1968294A | Guard rail | |
| US1910247A | Highway marker | |
| US1523961A | Concrete form | |
| US1496933A | Concrete form | |
| US1495305A | Concrete form | |
| US1509597A | Car unloader | |
| US1065524A | Rail-joint. |