Tamron patented a series of APS-C travel zooms from 18-100mm up to 18-500mm

Tamron patented a variation of travel zooms made for APS-C mirrorless cameras:

• 18-100mm f/4.0-5.6
• 18-200mm f/3.5-6.5
• 18-260mm f/3.5-6.5
• 18-290mm f/3.5-6.5
• 18-390mm f/3.5-6.5
• 18-490mm f/3.5-6.5

via Hi Lows Note