| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Canada | 5 |
| # | Technology | |
|---|---|---|
| #1 | Spectacles | |
| #2 | Manufacturing processes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Toulmin Jr Harry A | 4 |
| #2 | Stanley Nathan M | 3 |
| #3 | Silverman Jack R | 2 |
| #4 | Hancock Virgil H | 2 |
| #5 | Silverman Jack Rupert | 2 |
| #6 | Toulmin Jr Harry Aubrey | 1 |
| #7 | Heavyside Stuart Joseph | 1 |
| #8 | Stanley Nathan Meyer | 1 |
| #9 | Heavyside Stuart J | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2183885A | Lens | |
| US1996442A | Method of making multifocal lens segments | |
| US1924336A | Bifocal lens | |
| US1949699A | Bifocal lens | |
| US1958729A | Bifocal lens | |
| US2033573A | Lens | |
| US1949698A | Lens | |
| US1879769A | Lens | |
| US1906672A | Eyeglass lens | |
| US1845940A | Lens | |
| US1912165A | Lens | |
| US1899777A | Lens | |
| CA360259A | Lens | |
| CA320242A | Lens | |
| CA345870A | Lens | |
| CA403266A | Multifocal lens | |
| CA403265A | Multifocal lens |