Governed by Article 22 of the 2021 Revised Patent Law, novelty prohibits any technical
scheme disclosed by prior public sale; a well-documented floor cleaning machine utility
model case fully exposes two fatal overseas enterprise filing defects: failure to lock
confidential sales channels before filing and incomplete cross-platform e-commerce
evidence archiving risks full invalidation. This real CNIPA reexamination case clarifies prior-use
evidentiary standards for mechanical utility models and delivers pre-filing market control
guidance for global hardware manufacturers.
A German household appliance brand filed a utility model patent (ZL202320116XXX) for an
integrated handheld floor washer in March 2023, claiming a detachable water tank structural
improvement. Before the official filing date, the brand authorized a Chinese cross-border
e-commerce distributor to conduct pre-sale activities on Taobao and JD platforms for
promotional testing. The distributor released complete product structural photos, dimensional
parameters and disassembly videos online two months ahead of the patent application. A
domestic cleaning equipment manufacturer retrieved archived platform sales pages, transaction
invoices and user unboxing screenshots, then filed full invalidation with the Patent
Reexamination Board (PRB) in late 2023. Two irreversible evidence defects led to total patent
cancellation: First, the pre-sale public sale constituted complete prior disclosure under
Article 22; the German side could not provide written confidentiality agreements with the
e-commerce operator to prove restricted circulation. Second, the brand only retained partial
internal product drawings without archiving platform release records, so it failed to refute the
complete prior art evidence chain submitted by the challenger. PRB ruled the utility model
lacked absolute novelty and issued a full invalidation decision. The German enterprise spent
over 118,000 RMB on re-development, re-filing and market brand remediation, losing 12
months of exclusive structural protection in China’s home appliance market.
Prior public sale destroys novelty (Patent Law Article 22.2). Any commercial pre-sale, offline
exhibition or mass online listing that fully discloses the product’s structural features counts as
prior art. Confidential internal R&D samples without public circulation do not invalidate novelty,
but open e-commerce pre-sales without non-disclosure agreements eliminate patent eligibility.
Complete cross-platform evidence chain standard for prior use. Valid prior public sale evidence
includes archived web pages, official electronic VAT invoices, user review videos and third-party
platform snapshot certifications. Isolated screenshots without timestamp authentication are
inadmissible during PRB hearings.
Utility model preliminary examination limitation. Unlike invention patents, utility models only
conduct preliminary novelty checks at filing; third-party invalidation after grant becomes the core
channel to judge prior public sale defects.
No retroactive confidentiality remedy. Even if the brand terminates e-commerce pre-sales after
discovering leakage, the earlier public disclosure cannot be erased to restore novelty; the only
remedy is to redesign the structure and re-file a new application.
Foreign applicant document requirement. All overseas R&D confidentiality contracts must attach
certified Simplified Chinese translations to serve as counter-evidence against prior public sale
invalidation.
China’s statutory prior public sale novelty bar under Article 22 sets strict market launch limits for
overseas hardware innovators. This floor washer utility invalidation case fully proves unregulated
pre-sale online exposure and missing confidentiality contracts result in total loss of patent
rights. For global home appliance and mechanical equipment brands, standardized NDA management
and delayed public product release are irreplaceable safeguards to maintain utility model novelty and
stable patent validity.
Hyperlink List：
● CNIPA Official Novelty & Prior Public Use Examination Guideline：
https://www.cnipa.gov.cn/art/2024/01/art_2651_187643.html
● WIPO Lex English Version 2021 China Patent Law Article 22:
https://wipo.int/wipolex/en/text/585084
● PRB Utility Model Invalidation Typical Case Database:
