| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 4 | |
| #2 | Germany | 2 | |
| #3 | New Zealand | 2 | |
| #4 | Australia | 1 | |
| #5 | Belgium | 1 | |
| #6 | Canada | 1 | |
| #7 | Switzerland | 1 | |
| #8 | Italy | 1 | |
| #9 | Sweden | 1 | |
| #10 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Macromolecular chemistry and polymers | |
| #2 | Machines | |
| #3 | Optics |
| # | Name | Total Patents |
|---|---|---|
| #1 | Covington William S | 4 |
| #2 | Covington William Seth | 2 |
| #3 | Covington W S | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US4824688A | Hydrogel lens with a simulated iris portion | |
| DE2941264A1 | POLYMER FOR CONTACT LENSES AND THE LIKE, CONTACT LENS AND METHOD FOR PRODUCING SUCH A | |
| NZ183696A | Cross-linked copolymer of a polysiloxane and an ester or an anhydride compound;ocular membrane |