| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | South Africa | 3 | |
| #3 | Argentina | 2 | |
| #4 | Australia | 2 | |
| #5 | Belgium | 2 | |
| #6 | Brazil | 2 | |
| #7 | Germany | 2 | |
| #8 | Spain | 2 | |
| #9 | France | 2 | |
| #10 | Canada | 1 | |
| #11 | United Kingdom | 1 | |
| #12 | Italy | 1 |
| # | Name | Total Patents |
|---|---|---|
| #1 | Peters E | 3 |
| #2 | Ohmura Y | 2 |
| #3 | Barnes C | 2 |
| #4 | Kimura T | 2 |
| #5 | Barnes C E | 2 |
| #6 | Yoshimura T | 1 |
| #7 | Takamiya T | 1 |
| #8 | Hisamoto K | 1 |
| #9 | Peters E M | 1 |
| #10 | Upadhyaya J | 1 |
| Publication | Filing date | Title |
|---|---|---|
| ES460155A3 | Procedure for the production of a 2-pirrolidone polymer. (Machine-translation by Google Translate, not legally binding) | |
| AU1629876A | Polymer of 2-pyrrolidone | |
| US3806427A | Purification of pyrrolidone with a boron compound | |
| US3804813A | Continuous process for forming polylactams | |
| US3763338A | Polypyrrolidone fiber for activating sensor means in a humidity responsive device | |
| US3778402A | Polymerization of 2-pyrrolidone using a catalyst formed by reaction between 2-pyrrolidone and aqueous koh |