Prosecution Insights
Last updated: October 02, 2026
Application No. 18/591,695

IN SITU REMOVABLE BLOCKING LAYER FORMATION

Non-Final OA §112
Filed
Feb 29, 2024
Examiner
CHEN, DAVID Z
Art Unit
2815
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Tokyo Electron Limited
OA Round
1 (Non-Final)
45%
Grant Probability
Moderate
1-2
OA Rounds
1y 0m
Est. Remaining
95%
With Interview

Examiner Intelligence

Grants 45% of resolved cases
45%
Career Allowance Rate
308 granted / 689 resolved
-23.3% vs TC avg
Strong +50% interview lift
Without
With
+50.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 7m
Avg Prosecution
51 currently pending
Career history
754
Total Applications
across all art units

Statute-Specific Performance

§101
0.2%
-39.8% vs TC avg
§103
49.1%
+9.1% vs TC avg
§102
24.9%
-15.1% vs TC avg
§112
25.1%
-14.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 689 resolved cases

Office Action

§112
DETAILED ACTION The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . 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 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. Response to Amendment/Restriction Applicant's election with traverse of Group 1: Species I, Sub-Species 1, and claims 1-3, 6-15, and 17 in the reply filed on June 01, 2026 is acknowledged. The traversal is on the ground(s) that “Applicant respectfully notes that the additional burden to search the three unelected claims after examining the fourteen elected claims is not significant enough to warrant a species/sub-species restriction.” This is not found persuasive because the species comprise different steps for forming the blocking layer and the steps are not obvious variants. The requirement is still deemed proper and is therefore made FINAL. Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claims 1-3 and 6-11 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. As to claim 1, the limitation “a vertical stack of layers of a first material suspended between structures of a second material…the blocking layer inhibiting diffusion of the etchant gas into the second material” appears to direct to the processing steps on the vertical stack of layers. However, as seen in FIG. 1, the processing steps are directed two distinct devices, where the blocking layer is merely formed on one vertical stack having the first and second materials and the blocking layer merely inhibits the diffusion to the second material of said vertical stack. The target material is removed in another vertical stack also having first and second materials, where the blocking layer is not formed and thus does not inhibit the diffusion. Clarification is required as the diffusion is inhibited in one vertical stack but not in another vertical stack. Thus, the limitation render the claims indefinite and clarification is required. Allowable Subject Matter Claims 12-15 and 17 are allowed. Claims 1-3 and 6-11 would be allowable if rewritten or amended to overcome the rejection(s) under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), 2nd paragraph, set forth in this Office action. Conclusion Prior art made of record is considered pertinent to Applicants’ disclosure: Zhang et al. (US 2020/0350215 A1). Any inquiry concerning this communication or earlier communications from the examiner should be directed to DAVID CHEN whose telephone number is (571)270-7438. The examiner can normally be reached M-F 12-6. 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, JOSHUA BENITEZ can be reached on (571) 270-1435. 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. /DAVID CHEN/Primary Examiner, Art Unit 2815
Read full office action

Prosecution Timeline

Feb 29, 2024
Application Filed
Aug 17, 2026
Non-Final Rejection mailed — §112 (current)

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

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Prosecution Projections

1-2
Expected OA Rounds
45%
Grant Probability
95%
With Interview (+50.1%)
3y 7m (~1y 0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 689 resolved cases by this examiner. Grant probability derived from career allowance rate.

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