A quick review of FASA1645 Invading Clans produced nuggets on the following five Clans
Ghost Bear (page 16, Invading Clans)
While they were the last Clan to adopt the OmniMech they did make several important discoveries. Ghost Bear was the first Clan to profit by mining rare raw materials from the asteroid belts common to many Kerensky Cluster systems. While other Clans worked for their profits by mining on the planets proper, Clan Ghost Bear developed unmatched techniques to efficiently strip-mine asteroids. They also devoted their scientific capabilities to new methods of purifying water, and are credited with producing the first strain of Shipeley wheat, a strain so resistant and hardy that it can grow in any soil and climate, including the mineral-poor ground of Strana Mechty's icy southern continent.
Smoke Jaguar (page 49-50, Invading Clans)
Saying even less then the Ghost Bear section if you can believe the Smoke Jaguars seem to have very little to no scientific achievement during the Golden Century. Their warrior caste was able to seize innovations like the OmniMech it really doesn’t say much about the scientists.
Steel Viper (page 84, Invading Clans)
It was their scientists who successfully engineered the Ultra version of the Class 20 Autocannon, which remains the single deadliest ‘Mech weapon on the battlefield today. Their Great Khan, Sanra Mercer, did prohibit contact with lower caste members (scientists) to protect research and development operations from weapon masters and techs of other Clans. One of the last Clans to field the OmniMech.
Nova Cat (page 108, Invading Clans)
Its scientist caste perfected the technology of the modern Clan energy weapons, making these staples of war smaller, lighter, more powerful and able to inflict more serious damage at longer range. Being first to develop these improved weapons gave Nova Cat warriors undisputed battlefield superiority for as long as it took the rest of the Clans to obtain the blueprints and manufacture their own models
Diamond Shark (page 133-134, Invading Clans)
The technician and scientist castes gave Clan Sea Fox its most important military edge, the OmniMech. Via the Chatterweb, Clan Sea Fox techs and scientists learned of Clan Coyote's researches into early OmniMech technology. Quick to see its potential, members of Clan Sea Fox offered their own considerable scientific and technical expertise on the Coyote project. Scientists and technicians from both Clans worked together on the development of the Omni Mech, and so Clan Sea Fox was among the first Clans to field the powerful new machines.