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patent expiration
16 May, 2023 0 Editorial Team

What To Do If A Provisional Patent Application Expires?


A provisional patent application serves as a valuable tool for inventors, providing a 12-month period to further develop and refine their inventions before filing a non-provisional patent application. However, what happens when the provisional patent application expires? In this blog post, we will explore the options available to inventors when their provisional patent application reaches its expiration date. Whether you missed the deadline or need more time, this comprehensive guide will help you navigate the situation and determine the best course of action.

  1. Understanding Provisional Patent Application Expiration:

The expiration of a provisional patent application occurs exactly 12 months after its filing date. Once expired, the provisional application no longer offers any legal protection or priority for your invention. It is essential to be aware of this expiration date to ensure timely action to protect your intellectual property.

  1. Evaluate the Status of Your Invention:

Before proceeding, it is crucial to assess the current status of your invention. Consider the following factors:

a) Development Progress: Determine the progress made on your invention during the provisional patent period. Have there been significant advancements or improvements? Have you encountered any obstacles or challenges that require more time for refinement?

b) Market Potential: Evaluate the market potential of your invention. Has there been substantial interest from potential investors, partners, or customers? Assessing the commercial viability of your invention will help guide your decision-making process.

c) Competitor Landscape: Examine the competitive landscape to understand if similar inventions have been introduced during the provisional patent period. This evaluation will help determine the potential impact on the patentability and marketability of your invention.

  1. File a Non-Provisional Patent Application:

If you believe your invention is ready for full patent protection, filing a non-provisional patent application is the next step. This application will undergo examination by the patent office, and if approved, it grants you exclusive rights over your invention. Important considerations include:

a) Timing: It is crucial to file the non-provisional application as soon as possible after the expiration of the provisional application. Delaying the filing may jeopardize your chances of obtaining patent protection, as someone else may file a similar invention during that time.

b) Documentation: Prepare a comprehensive non-provisional patent application that meets all formal requirements. Include a detailed description, claims, and any necessary drawings or diagrams. Provide clear and concise explanations of the invention’s novelty, inventive step, and industrial applicability.

c) Priority Date: Make sure to reference the provisional application in the non-provisional application to retain the original priority date. This will help establish the earliest possible filing date for your invention.

  1. Seek Continuation or Conversion Options:

In some cases, inventors may need additional time or different patent strategies after the expiration of the provisional patent application. Consider the following alternatives:

a) Continuation Application: If your invention has evolved or requires further development, you can file a continuation application. This allows you to build upon the original application and expand the scope of your patent claims while maintaining the priority date of the provisional application.

b) Conversion to a Non-Provisional Application: In certain situations, it may be possible to convert your expired provisional application into a non-provisional application. This option allows you to salvage the progress made and potentially overcome any missed deadlines.

c) Refiling as a New Provisional Application: If the invention has undergone significant changes or improvements, you may consider re-filing a new provisional application to establish a fresh 12-month period for further development before filing a non-provisional application.

  1. Seek Legal Advice:

Navigating the post-expiration process can be complex, and seeking the guidance of a qualified patent attorney is highly recommended. A patent attorney can

assess your specific situation, provide personalized advice, and help you choose the most appropriate course of action to protect your invention.


When a provisional patent application expires, inventors must carefully assess their options to ensure adequate protection for their inventions. Whether filing a non-provisional application, pursuing continuation or conversion options, or seeking legal advice, it is crucial to take prompt action to preserve your intellectual property rights. Remember, each situation is unique, and consulting a patent attorney will provide the expertise needed to make informed decisions and navigate the complex patent process effectively.