Table 1. Canadian Patent Document Kind Codes
| Kind Code | Document Type | Note |
|---|---|---|
| A | Patent | Prior to Oct. 1, 1989 |
| A | Laid-open application | Oct. 1, 1989-present |
| B | Reissue patent | Prior to Oct. 1, 1989 |
| C | Patent | Oct. 1989-present |
| E | Reissue patent | Oct. 1989-present |
| F | Certificate for reexamined patent |
Patent Librarian's Notebook 