Administered by the United States Patent and Trademark Office (USPTO), U.S. utility and
design patents are governed by Title 35 of the United States Code, where novelty
stipulated in §102 acts as a fundamental eligibility criterion for patent grant. Different
from many other jurisdictions, the U.S. has established a unique 12-month grace
period for self-disclosed inventions, which allows applicants to file valid patent
applications within one year after their own public disclosure, sales or exhibition of the
invention. However, this flexible rule comes with strict boundaries and frequent application
pitfalls. This case study focuses on a typical novelty rejection caused by improper use
of the grace period, explains the judgment standards for prior art and grace period
restrictions, and delivers targeted compliance advice for global R&D teams and innovators.
A high-tech startup specializing in wearable smart devices completed a new wearable
sensor invention in early 2024. To collect market feedback and seek investment
opportunities, the team displayed the prototype and released technical introductions at a
national electronic product exhibition in March 2024, and also launched pre-sale activities
on official e-commerce platforms afterwards. Fully aware of the U.S. 12-month grace period
rule, the company delayed the patent filing plan and formally submitted a utility patent
application to USPTO in January 2025, nearly 10 months after the public disclosure.
During the substantive examination, the USPTO examiner issued a novelty rejection.
The examiner confirmed that besides the applicant’s own exhibition and pre-sale records,
a third-party competitor had independently developed a highly similar technical solution
and published relevant technical papers in November 2024, which fell before the filing date
and constituted legitimate prior art. While the applicant’s own public acts could
be exempted by the grace period, third-party disclosures outside the applicant’s
control were not covered by this exception. After multiple unsuccessful arguments, the
application was finally rejected for lack of novelty. The startup lost the opportunity to
obtain exclusive patent rights, and its core technology was quickly replicated by rivals.
First, the scope of the U.S. 12-month grace period is clearly limited. It only applies to the
applicant’s own public disclosures, including self-exhibition, sales, publication and
internal technical sharing with unrestricted third parties. Any public disclosure made by
independent third parties prior to the filing date cannot be shielded by the grace period
and will be deemed valid prior art to destroy novelty.
Second, multiple types of prior art will be comprehensively reviewed by USPTO. Examiner’s
prior art search covers published patents, academic papers, publicly used products,
commercial sales records and exhibition materials from all over the world. Even non-patent
literature and public use records can become grounds for novelty rejection.
Third, the grace period is a remedial provision rather than a permission for delayed filing.
Applicants cannot intentionally postpone filing relying on this rule. Once any third party
independently discloses the same or similar technology during the grace period, the
invention will permanently lose patent eligibility.
Fourth, the time calculation of the grace period starts from the first public disclosure
date. Multiple successive public activities will not reset the timeline, and applicants
must complete filing before the one-year deadline expires.
Prioritize patent filing before any public promotion, exhibition or pre-sale of new
technologies and products, which is the most reliable way to avoid novelty risks. Do not
rely excessively on the grace period.
Conduct comprehensive prior art searches via USPTO official databases and global patent
platforms before disclosure and filing, to find existing similar technologies in a timely
manner and adjust R&D and filing strategies.
If public display or sales have to be arranged in advance, compress the interval between
disclosure and patent filing as much as possible, and monitor technical dynamics of peer
competitors throughout the grace period.
Sort out and archive all disclosure records, exhibition photos, sales data and
communication documents. These materials can be used to prove the time and nature
of self-disclosure when responding to office actions.
For cross-border R&D projects, unify the timeline of technical confidentiality and patent
layout across all teams, and prohibit arbitrary external disclosure of pending technical
solutions.
The 12-month grace period under U.S. patent law provides a buffer for innovators,
yet it contains significant hidden risks. This novelty rejection case fully proves that the g
race period cannot offset the impact of third-party prior art. For global technological
enterprises and research institutions, adhering to the principle of filing first, disclosing
later is the core strategy to maintain patent novelty. Combined with thorough prior art
retrieval and dynamic competitor monitoring, enterprises can effectively prevent novelty
rejections and secure stable exclusive rights for their R&D achievements in the U.S. market.
Hyperlink List：
● IPcrossark:
https://www.ipcrossark.com/en/patent_detail/4.html
● USPTO Official Patent Public Search System:
https://www.uspto.gov/patents/apply/patent-public-search
● USPTO Guidelines on Novelty and Grace Period:
