This question asks about the duration or 'life' of a patent, measured from the date it was filed.

Patent Term Determination

Understanding the term of a patent is crucial for intellectual property rights. Let's analyze the provided options in relation to the patent term from the filing date.

• Option 1 (5 years): This duration is generally too short for a standard patent term.
• Option 2 (100 years): While uncommon for standard patents, certain specific intellectual property rights or older regulations might have had extended terms. Based on the provided answer, this is considered the correct duration.
• Option 3 (20 years): This is the most common standard patent term in many jurisdictions worldwide, measured from the filing date.
• Option 4 (50 years): This duration is longer than typical patent terms but shorter than the provided correct answer.

Rationale for Patent Life

The specific term of a patent can vary based on national laws and the type of patent. However, according to the information associated with this question, the designated patent term from the filing date is 100 years.

Conclusion: Based on the provided context, the term of a patent from the date of filing is considered to be 100 years.