Terms of the sale were not disclosed.
Software maker E-Stamp said 10 days ago that it was leaving the postage business to merge with online learning company Learn2.com. Mountain View, Calif.-based E-Stamp officially dropped e-commerce last November and switched to developing software to help companies with shipping and logistics.
With Learn2.com, the company will provide Web-based educational software and online tutorials.
Most Internet postage companies have collapsed after failing to drum up sufficient customer interest.
Stamps.com said most of the patents it bought are related to Net-based postage printing and management, which it plans to use to attract small business and home office customers.