| Subject | English | Russian |
| patents. | patent of improvement withheld from reduction to practice in the hope of future use | запасной патент |
| patents. | patent of improvement withheld from reduction to practice in the hope of future use | не используемый патент |
| patents. | patent withheld from reduction to practice | ещё не использованный патент (in the hope of future use; предназначенный для последующего использования) |