Prosecution Insights
Last updated: October 27, 2026
Application No. 18/448,487

SINTERED R-FE-B PERMANENT MAGNET, PREPARATION METHOD AND USE THEREOF

Final Rejection §112
Filed
Aug 11, 2023
Priority
Aug 11, 2022 — CN 202210962847.2
Examiner
HOBAN, MATTHEW E
Art Unit
1734
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Yantai Zhenghai Magnetic Material Co. Ltd.
OA Round
2 (Final)
60%
Grant Probability
Moderate
3-4
OA Rounds
3m
Est. Remaining
86%
With Interview

Examiner Intelligence

Grants 60% of resolved cases
60%
Career Allowance Rate
518 granted / 857 resolved
-4.6% vs TC avg
Strong +26% interview lift
Without
With
+25.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 6m
Avg Prosecution
35 currently pending
Career history
897
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
52.9%
+12.9% vs TC avg
§102
17.2%
-22.8% vs TC avg
§112
20.0%
-20.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 857 resolved cases

Office Action

§112
Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Claim Objections Claim 11 is objected to because of the following informalities: The claim sets forth that the RH rich phase is distributed at ‘the intersection’ of three or more grains. There is insufficient antecedent basis for this term. Appropriate correction is required. Claim 15 is objected to because of the following informalities: The claim references ‘the green body’. There is insufficient antecedent basis for this term. Appropriate correction is required. Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(d): (d) REFERENCE IN DEPENDENT FORMS.—Subject to subsection (e), a claim in dependent form shall contain a reference to a claim previously set forth and then specify a further limitation of the subject matter claimed. A claim in dependent form shall be construed to incorporate by reference all the limitations of the claim to which it refers. The following is a quotation of pre-AIA 35 U.S.C. 112, fourth paragraph: Subject to the following paragraph [i.e., the fifth paragraph of pre-AIA 35 U.S.C. 112], a claim in dependent form shall contain a reference to a claim previously set forth and then specify a further limitation of the subject matter claimed. A claim in dependent form shall be construed to incorporate by reference all the limitations of the claim to which it refers. Claim 17 is rejected under 35 U.S.C. 112(d) or pre-AIA 35 U.S.C. 112, 4th paragraph, as being of improper dependent form for failing to further limit the subject matter of the claim upon which it depends, or for failing to include all the limitations of the claim upon which it depends. Claim 17 depends on claim 9, which in turn depends from claim 8 and claim 5. Claim 17 sets forth that RH and RL are in form of powders. This limitation is already present in instant claim 8, which sets forth that the diffusion material comprises powder of RH and RL. Thus the limitation of claim 17 already exists in claim 8, from which claim 17 depends. As this is the case, claim 17 does not further limit claim 9. Applicant may cancel the claim(s), amend the claim(s) to place the claim(s) in proper dependent form, rewrite the claim(s) in independent form, or present a sufficient showing that the dependent claim(s) complies with the statutory requirements. Allowable Subject Matter Claim 1-9 and 11-16 and 18 are allowable over the prior art (it is noted that claims 11 and 15 are currently objected to). The following is an examiner’s statement of reasons for allowance: The closest prior art to Li (US20140065004; previously cited) teaches a similar permanent magnet having a composite main phase, wherein one of the main phases has a Ce rich phase having an overlapping Ce-content with the Ce-rich phase claimed. Li teaches that the other phase explicitly does not contain Ce (See Paragraph 24). Li teaches that including a single alloy containing Ce leads to the creation of permanent magnets having reduced properties and thus teaches away from incorporating Ce into each of the main phases. Kim in 11682506 is also noted as being relevant prior art. Kim teaches a permanent magnet having a Ce-rich phase and a Ce-poor phase; however Kim also teaches that the content of Ce in the Ce-poor phase is 0 wt% and not chosen to be between 0.1 and 1 wt% (See Examples 1-1 to 1-9, 3-1 to 3-6, 4-1 to 4-9, and 6-1 to 6-6). Those of ordinary skill in the art would not have found it obvious to arbitrarily provide 0.1 to 1 wt% Ce in such an alloy where Kim specifically shows the content is 0 wt%. Additionally Kim teaches a diffusion treatment that is different from the one that is claimed and would not appear to provide a content of RH in the grain boundaries that is greater than in said grains. Those of ordinary skill would not have been motivated to arbitrarily replace the diffusion treatment of Kim with the powder based diffusion of Lim as Kim teaches away from grain boundary diffusion (See Background; grain boundary diffusion effectively creates the claimed feature of RH content being greater in the grain boundaries providing a diffusion gradient). As this is the case, the claims cannot be anticipated or rendered obvious by the prior art. Any comments considered necessary by applicant must be submitted no later than the payment of the issue fee and, to avoid processing delays, should preferably accompany the issue fee. Such submissions should be clearly labeled “Comments on Statement of Reasons for Allowance.” Response to Arguments Applicant’s arguments, see pages 7-11, filed 9/17/26, with respect to the objections and rejections of the claims have been fully considered and are persuasive. The objections to the claims, rejections under USC 112, and rejections under USC103 of claims 1-9 has been withdrawn. The amendments to the claims render moot the objections and rejections under USC 112 and do not appear to contain new matter. The scope of the claims now set forth that the Ce-poor contains cerium in a non-zero amount. This overcomes the art rejection under USC 103 as is discussed above. New claims 11-18 are noted. While the new claims do not appear to include new matter, the claims give rise to two claim objections and a claim rejection under USC 112(d) as claim 17 does not appear to further limit the claims and claims 11 and 15 are objected to as having insufficient antecedent basis therein. Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to MATTHEW E HOBAN whose telephone number is (571)270-3585. The examiner can normally be reached M-F 9:30am-6:00pm. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Jonathan Johnson can be reached at 571-272-1177. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /Matthew E. Hoban/Primary Examiner, Art Unit 1734
Read full office action

Prosecution Timeline

Aug 11, 2023
Application Filed
Jun 17, 2026
Non-Final Rejection mailed — §112
Sep 17, 2026
Response Filed
Sep 30, 2026
Final Rejection mailed — §112
Oct 23, 2026
Response after Non-Final Action

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12767885
QUANTUM DOT, PREPARATION METHOD THEREOF, AND QUANTUM DOT FILM
3y 4m to grant Granted Oct 20, 2026
Patent 12772625
LIGHT EMITTING COMPONENT, A LIGHT EMITTING DEVICE AND A SHEET-LIKE MATERIAL
3y 11m to grant Granted Oct 20, 2026
Patent 12767886
SEMICONDUCTOR NANO-PARTICLE COMPOSED OF AgAuS-BASED COMPOUND
3y 1m to grant Granted Oct 20, 2026
Patent 12759950
SEMI-CRYSTALLINE POLYMER-CERAMIC CORE-SHELL PARTICLE POWDERS, AND PROCESSES FOR MAKING AND ARTICLES COMPRISING SUCH POWDERS
4y 6m to grant Granted Oct 13, 2026
Patent 12758952
ESSENTIALLY CLAY FREE FCC CATALYST WITH INCREASED CONTAMINANT RESISTIVITY, ITS PREPARATION AND USE
3y 5m to grant Granted Oct 13, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

Strategy Recommendation AI-generated — please review before filing

Get a prosecution strategy drawn from examiner precedents, rejection analysis, and claim mapping.
Typically takes 5-10 seconds — AI-generated, attorney review required before filing

Prosecution Projections

3-4
Expected OA Rounds
60%
Grant Probability
86%
With Interview (+25.6%)
3y 6m (~3m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 857 resolved cases by this examiner. Grant probability derived from career allowance rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month