Answer and Explanation:
The Journal entry is shown below:-
1. Research and development expense Dr, $170,000
To Cash $170,000
(Being research and development expense is recorded)
2. Patents Dr, $18,000
To Cash $18,000
(Being capitalize the legal costs is recorded)
3. Patent amortization expense Dr, $450 (18,000 ÷ 10 years × 3 ÷ 12)
To Patents $450
(Being patent amortization expense is recorded)