Notebook only has Shenzhou elegant series, which basically meets your requirements, but the battery can't last for 4 hours.

A200-D52 D 1

A350-T35 D2

A400-D52S D 1

A360-P62 D 1

A420P-B95 D 1

Netbooks, look at these: 1750-2500. Basically, they are dual-core ATOM 570 processors.

Acer ASPIRE ONE D257E-N57CKK

HP 1 10-36 19T

Samsung NC 1 10-N0 series

Asustek EeePC 10 15PX/PW