Governed by the 2021 Revised Patent Law of the People’s Republic of China (Articles
34–37) and administered by the China National Intellectual Property Administration (CNIPA),
invention patents represent the highest-level technical patent protection in China,
covering new technical solutions for products, manufacturing processes and material
compositions. Unlike utility models and design patents, invention patents undergo mandatory
full substantive examination focusing on novelty, inventiveness (non-obviousness) and
practical applicability. The cross-border Patent Prosecution Highway (PPH) program, a
core international cooperation mechanism operated by CNIPA, allows global applicants to
request expedited substantive reviews based on favorable examination results from foreign
IP offices. Multinational semiconductor, biotech and new energy firms regularly face prolonged
examination cycles, office action rejection risks and lost market opportunities due to
ignorance of strict substantive examination thresholds and PPH formal filing prerequisites.
This case analyzes a European new energy battery enterprise’s failed PPH application and
repeated inventiveness rejections, unpacks CNIPA’s core substantive examination benchmarks
and PPH eligibility standards, and delivers standardized cross-border filing compliance guidance
for overseas innovative corporations.
First, Three statutory patentability criteria govern all invention substantive examination
(Patent Law Art.22). No invention patent may be granted unless it satisfies three parallel
mandatory standards:
Novelty: The technical solution must not be disclosed in any domestic or foreign prior publication,
public use or public oral disclosure before the filing date; absolute worldwide novelty applies
under Chinese patent rules.
Inventiveness (non-obviousness): Compared with the closest prior art, the invention must possess
prominent substantive features and remarkable technical progress. CNIPA examiners adopt the
three-part “closest prior art + distinguishing features + unexpected technical effect” test. Pure
combination of known technical means without verifiable unexpected performance gains will be
rejected for lack of inventiveness.
Practical applicability: The invention can be industrially manufactured or utilized and can generate
positive technical effects; purely theoretical lab concepts without reproducible industrial parameters
are ineligible. Missing quantitative comparative effect data in the Chinese specification is the top
cause of inventiveness office actions for foreign applicants.
Second, rigid PPH eligibility and documentary rules apply to all cross-border accelerated requests.
To qualify for CNIPA PPH expedited substantive examination: (1) The Chinese national phase
application and foreign corresponding application must share the identical earliest priority date;
(2) At least one independent claim of the foreign case has been deemed allowable by a participating
IP office (USPTO, EPO, JPO, KIPO etc.); (3) Complete supporting materials including foreign search
reports, allowance notices and claim comparison tables with certified Simplified Chinese
translation must be submitted within valid request timelines. Foreign applicants without a
CNIPA-licensed local patent agent cannot file PPH requests independently. Missing translated
foreign examination documents leads to automatic PPH dismissal with no supplementary
correction grace period. PPH cuts substantive examination waiting time from average 30 months
to 6–10 months if all formalities are fully compliant.
Third, strict 3-year substantive examination request deadline (Patent Law Art.35). After the 18-month
automatic publication of the Chinese invention application, applicants must file a formal request
for substantive examination within three years from the original national phase filing date. Any
delay beyond this hard deadline results in automatic abandonment of the entire invention
application, with no equitable extensions for overseas attorney delays or cross-border
communication lags. PPH requests must be submitted prior to expiry of this three-year window to
retain accelerated review eligibility.
Fourth, mandatory full Chinese disclosure for all national phase cases. All technical specifications,
claims, drawings and supplementary experimental data must be translated into standardized
Simplified Chinese with complete accuracy. Foreign-language lab reports attached without
certified Chinese translations will not be admitted as evidence to overcome inventiveness
rejections during substantive examination. PCT original English text cannot replace
complete Chinese specification disclosure requirements.
Fifth, exclusive local agent mandate for overseas filers. Any foreign enterprise or individual
without permanent domicile or business premises inside China must entrust a CNIPA registered
domestic patent agency to handle invention filing, substantive examination responses and PPH
formalities. Direct self-filing by overseas entities is statutorily invalid and will be returned by CNIPA
at the formality stage.
China’s invention patent system, supported by the three-fold novelty-inventiveness-applicability
statutory test and international PPH accelerated mechanism, delivers robust 20-year
exclusive technical protection for global innovative firms. However, untranslated foreign
examination records, insufficient Chinese experimental effect disclosure and missed 3-year
substantive examination deadlines create irreversible prosecution delays and market loss risks
for cross-border R&D groups. This European solid-state battery PPH failure case fully proves
incomplete PPH documentary compliance and sparse technical effect data will eliminate accelerated
review benefits and trigger repeated inventiveness office actions. For overseas semiconductor,
new energy and biotech innovators entering China, integrated Chinese experimental disclosure
design, timely fully-translated PPH material submission and strict three-year deadline tracking
are mandatory to secure fast, stable invention patent grants and capture domestic market
technological monopoly advantages.
Hyperlink List：
● IPcrossark:
IPcrossark—Reliable IP Registration Platform | Trademark, Patent & Copyright Help
● WIPOLEX Full English Version of China 2021 Revised Patent Law:
