The citation source category indicates the relevance of the citation. Note that categories may appear in combinations such as PDX, indicating that categories P, D, and X are present. This occurs when examiners assign different categories to different claims or group of claims within the same patent citation.
Values include the following:
Source Category | Description |
---|---|
A | Technological background: defining the state of the art and not prejudicing novelty or inventive step. |
D | Document cited in the application. |
E | Earlier patent document, but published on or after the filing date of the application searched. Indicates potentially conflicting patent documents. |
I | References cited by publications with a publication date of April 2011 or later may have category "I". Category "I" is category "X" further defined: |
L | Document cited for other reasons. |
O | Non-written disclosure. |
P | Intermediate document. |
R | CN only. Referring to a patent application or a utility model filed on the same day which relates to the same invention. |
T | Theory or principle underlying the invention. |
X | Particularly relevant if taken alone. |
Y | Particularly relevant if combined with another document of the same category. |