Prosecution Insights
Last updated: August 01, 2026
Application No. 18/010,755

DEVICE FOR HEATING A MATERIAL USING MICROWAVES, METHOD FOR HEATING A MATERIAL USING MICROWAVES, AND SYSTEMS FOR HEATING A MATERIAL USING MICROWAVES

Final Rejection §103
Filed
Dec 15, 2022
Priority
Jun 17, 2020 — BR 102020012185-5 +2 more
Examiner
VAN, QUANG T
Art Unit
3761
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Vale S A
OA Round
2 (Final)
74%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
82%
With Interview

Examiner Intelligence

Grants 74% — above average
74%
Career Allowance Rate
813 granted / 1097 resolved
+4.1% vs TC avg
Moderate +8% lift
Without
With
+8.3%
Interview Lift
resolved cases with interview
Typical timeline
3y 5m
Avg Prosecution
19 currently pending
Career history
1109
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
84.9%
+44.9% vs TC avg
§102
8.8%
-31.2% vs TC avg
§112
2.7%
-37.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1097 resolved cases

Office Action

§103
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 Rejections - 35 USC § 103 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. Claim(s) 1-2, 6 is/are rejected under 35 U.S.C. 103 as being unpatentable over Welch (US 2,714,070) new cited, in view of Hakamata et al (US 5,133,825) previously cited. Regarding claims 1 and 6, Welch discloses a microwave heating apparatus and method comprising a main cavity (11) that define an inner and outer portion of device, the main cavity (11) being provided with at least one wall (Figure 1), the main cavity (11) being configured to receive at least one source (13) of electromagnetic wave emission configured to emit electromagnetic waves directly into the main cavity (11). However, Welch does not disclose at least one wall of the main cavity comprises at least one portion bent at an acute angle formed against a vertical centerline of reference of the main cavity, wherein that at least one wall of the main cavity, a permanent magnet element is arranged. Hakamata discloses at least one wall of the main cavity comprises at least one portion bent at an acute angle formed against a vertical centerline of reference of the main cavity (1, Figure 6), wherein that at least one wall of the main cavity, a permanent magnet element is arranged (Figure 6). It would have been obvious to one ordinary skill in the art before the effective filing date of the invention was made to utilize in Welch at least one wall of the main cavity comprises at least one portion bent at an acute angle formed against a vertical centerline of reference of the main cavity, wherein that at least one wall of the main cavity, a permanent magnet element is arranged as taught by Hakamata in order to improve distribution of electromagnetic waves. Regarding claim 2, Hakamata discloses the angle but does not specify the angle being provided between 150 and 400 . It would have been obvious to one ordinary skill in the art before the effective filing date of the invention to have the angle being provided between 150 and 400 in order to suitable for user specific application. Claim(s) 3-4, 7 is/are rejected under 35 U.S.C. 103 as being unpatentable over Welch (US 2,714,070) new cited, in view of Hakamata et al (US 5,133,825) previously cited and further in view of Mizutani (US 4,629,849) previously cited. Regarding claim 3, Welch/Hakamata discloses substantially all features of the claimed invention except at least one auxiliary cavity arranged inside the main cavity, between the source and the outer portion, the auxiliary cavity bounding an auxiliary region for reflecting at least part of the electromagnetic waves generated by the source. Mizutani discloses at least one auxiliary cavity arranged inside the main cavity, between the source and the outer portion, the auxiliary cavity bounding an auxiliary region for reflecting at least part of the electromagnetic waves generated by the source (col. 9, lines 51-60, Figures 4-7). It would have been obvious to one ordinary skill in the art before the effective filing date of the invention was made to utilize in Welch/Hakamata at least one auxiliary cavity arranged inside the main cavity, between the source and the outer portion, the auxiliary cavity bounding an auxiliary region for reflecting at least part of the electromagnetic waves generated by the source as taught by Mizutani in order to reflect microwave energy to heat the object. Regarding claim 4, in combination of references Welch/Hakamata, and Mizutani also discloses the auxiliary reflection region has a rectangular transverse profile (col. 9, lines 51-60 in Mizutani). Regarding claim 7, Mizutani discloses the suitable reflection of at least some of the electromagnetic waves emitted by the source in at least one portion of an auxiliary cavity arranged inside the main cavity, between the source and outer portion (col. 9, lines 51-60, Figures 4-7). Claim(s) 9-13 and 16-17 is/are rejected under 35 U.S.C. 103 as being unpatentable over Welch (US 2,714,070) new cited, in view of Hakamata et al (US 5,133,825) previously cited and further in view of JPH0437634A previously cited by applicant. Regarding claim 9, Welch/Hakamata discloses substantially all features of the claimed invention except a conveyor of a material to be heated and a material feed zone on the conveyor, the system further comprising a material heating zone, the material feed zone being arranged before the material heating zone, the material heating zone comprising at least one microwave heating chamber provided with at least one microwave heating device. JPH0437634A discloses a conveyor (22) of a material (14) to be heated and a material feed zone (21) on the conveyor (22), the system further comprising a material heating zone (27), the material feed zone (21) being arranged before the material heating zone (27), the material heating zone comprising at least one microwave heating chamber (25) provided with at least one microwave heating device (46). It would have been obvious to one ordinary skill in the art before the effective filing date of the invention to utilize in Welch/Hakamata conveyor of a material to be heated and a material feed zone on the conveyor, the system further comprising a material heating zone, the material feed zone being arranged before the material heating zone, the material heating zone comprising at least one microwave heating chamber provided with at least one microwave heating device as taught by JPH0437634A in order to provide continuous heating to the heating object. Regarding claim 10, JPH0437634A discloses plates of dielectric material (35) arranged on the conveyor (22). Regarding claim 11, Welch discloses at least on microwave containment housing around at least one device (Figure 1). Regarding claims 12-13, JPH0437634A discloses a conveyor (22) of a material (14) to be heated and a material feed zone (21) on the conveyor (22), the system further comprising a material heating zone (27), the material feed zone (21) being arranged before the material heating zone (27), the material heating zone comprising at least one microwave heating chamber (25) provided with at least one microwave heating device (46). Regarding claims 16-17, JPH0437634A discloses at least one sealing plate (35) adapted to seal a lower opening of the main cavity, wherein the at least one sealing plate comprising a Teflon plate. Claim(s) 14 is/are rejected under 35 U.S.C. 103 as being unpatentable over Welch (US 2,714,070) new cited, in view of Hakamata et al (US 5,133,825) previously cited, JPH0437634A previously cited by applicant and further in view of WO 2016/179317 previously cited. Regarding claims 14, Welch/Hakamata/JPH0437634A discloses substantially all features of the claimed invention except the at least one microwave containment housing, being comprises a Faraday cage. WO 2016/179317 discloses at least one microwave containment housing, being comprises a Faraday cage (specification page 1, lines 28-30, Figure 1). It would have been obvious to one ordinary skill in the art before the effective filing date of the invention to utilize in Welch/Hakamata/JPH0437634A the at least one microwave containment housing, being comprises a Faraday cage as taught by WO 2016/179317 in order to prevent microwave transmission out of the oven. Claim(s) 15 is/are rejected under 35 U.S.C. 103 as being unpatentable over Welch (US 2,714,070) new cited, in view of Hakamata et al (US 5,133,825) previously cited, JPH0437634A previously cited by applicant, WO 2016/179317 previously cited and further in view of DE 20018925U1 previously cited. Regarding claim 15, Welch/Hakamata/JPH0437634A/WO2016/179317 discloses substantially all features of the claimed invention except the at least one microwave containment extent over at least a portion of a belt conveyor. DE 20018925U1 discloses at least one microwave containment housing (2) extent over at least a portion of a belt conveyor (20, Figure 1). It would have been obvious to one ordinary skill in the art before the effective filing date of the invention to utilize in Welch/Hakamata/JPH0437634A/WO2016/179317 the at least one microwave containment extent over at least a portion of a belt conveyor as taught by DE 20018925U1 in order to transfer the heating object through the cavity within the housing. Response to Amendment Applicant’s arguments with respect to claim(s) 1-4, 6-7, and 9-17 have been considered but are moot because the new ground of rejection does not rely on any reference applied in the prior rejection of record for any teaching or matter specifically challenged in the argument. 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 QUANG T VAN whose telephone number is (571)272-4789. The examiner can normally be reached Mon-Fri 9:00-6:00. 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, Steven W Crabb can be reached at 571-270-5095. 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. /QUANG T VAN/Primary Examiner, Art Unit 3761 April 29, 2026
Read full office action

Prosecution Timeline

Dec 15, 2022
Application Filed
Dec 04, 2025
Non-Final Rejection mailed — §103
Mar 04, 2026
Response Filed
May 01, 2026
Final Rejection mailed — §103
Jul 30, 2026
Request for Continued Examination
Jul 31, 2026
Response after Non-Final Action

Precedent Cases

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
74%
Grant Probability
82%
With Interview (+8.3%)
3y 5m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1097 resolved cases by this examiner. Grant probability derived from career allowance rate.

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