06266649 is referenced by 736 patents and cites 22 patents.

A recommendations service recommends items to individual users based on a set of items that are known to be of interest to the user, such as a set of items previously purchased by the user. In the disclosed embodiments, the service is used to recommend products to users of a merchant's Web site. The service generates the recommendations using a previously-generated table which maps items to lists of “similar” items. The similarities reflected by the table are based on the collective interests of the community of users. For example, in one embodiment, the similarities are based on correlations between the purchases of items by users (e.g., items A and B are similar because a relatively large portion of the users that purchased item A also bought item B). The table also includes scores which indicate degrees of similarity between individual items. To generate personal recommendations, the service retrieves from the table the similar items lists corresponding to the items known to be of interest to the user. These similar items lists are appropriately combined into a single list, which is then sorted (based on combined similarity scores) and filtered to generate a list of recommended items. Also disclosed are various methods for using the current and/or past contents of a user's electronic shopping cart to generate recommendations. In one embodiment, the user can create multiple shopping carts, and can use the recommendation service to obtain recommendations that are specific to a designated shopping cart. In another embodiment, the recommendations are generated based on the current contents of a user's shopping cart, so that the recommendations tend to correspond to the current shopping task being performed by the user.

Title
Collaborative recommendations using item-to-item similarity mappings
Application Number
9/157198
Publication Number
6266649 (B1)
Application Date
September 18, 1998
Publication Date
July 24, 2001
Inventor
Eric A Benson
Seattle
WA, US
Jennifer A Jacobi
Seattle
WA, US
Gregory D Linden
Seattle
WA, US
Agent
Knobbe Martens Olson & Bear
US
Assignee
Amazon Com
WA, US
IPC
G06F 17/60
View Original Source