Here are the latest patents from Fujifilm, Tamron, and Canon:
Tamron 100-400mm, 28-400mm F3.5-6.3, and 50-500mm Patents Found
Canon 20-60mm F4 PZ, 18-45mm F4 PZ, and 16-35mm F4 PZ Lens Patents Found
Canon 70-200mm f/4 IS and APS-C Canon 18-50mm f/4 IS Patents Found
Canon RF 70-200mm f/2.8 L IS USM Z, 200-400mm f/4 and 200-500mm f/5.6 Patents Found