Prosecution Insights
Last updated: October 04, 2026
Application No. 18/769,580

AIR FILTERING SYSTEM

Non-Final OA §112
Filed
Jul 11, 2024
Priority
Jul 18, 2023 — DE 102023206792.7
Examiner
PREGLER, SHARON
Art Unit
Tech Center
Assignee
Karlsruher Institut Für Technologie
OA Round
1 (Non-Final)
78%
Grant Probability
Favorable
1-2
OA Rounds
4m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allowance Rate
701 granted / 899 resolved
+18.0% vs TC avg
Strong +21% interview lift
Without
With
+21.1%
Interview Lift
resolved cases with interview
Typical timeline
2y 7m
Avg Prosecution
42 currently pending
Career history
922
Total Applications
across all art units

Statute-Specific Performance

§101
1.4%
-38.6% vs TC avg
§103
50.0%
+10.0% vs TC avg
§102
17.8%
-22.2% vs TC avg
§112
21.6%
-18.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 899 resolved cases

Office Action

§112
DETAILED ACTION 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 1-16 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. Claim 1 The phrase “in particular” in lines 1 and 15 render the claim indefinite because it is unclear if the claim includes elements not actually disclosed (those encompassed by “in particular”). The phrase “the electrode assembly contains an electrode that has at least one emitter and a counter electrode, between which there is a voltage for generating a corona discharge” renders the claim unclear. Grammatically the phrase “that has” may be read as modifying “an electrode,” such that both the emitter and the counter electrode are part of the electrode. However, the phrase “between which” appears to refer to the electrode and the counter electrode as separate structures. Therefore, it is unclear whether the counter electrode is part of the electrode or is a distinct component of the electrode assembly. The claim can be clarified by the amendment: “wherein the electrode assembly contains an electrode having at least one emitter and a counter electrode, wherein a voltage is applied between the electrode and the counter electrode for generating a corona discharge in the air during operation.” Claim 2 The phrase “in particular” in line 6 renders the claim indefinite because it is unclear if the claim includes elements not actually disclosed (those encompassed by “in particular”). The phrase “connected to a second pole a counter pole of the power source” is unclear since it recites two nouns without grammatical relationship. It is unclear whether the electrode is connected to a second pole, a counter pole, or whether the counter pole is merely intended to identify the second pole. The phrase “such that the at least one conductive sections” render the scope unclear because “electrically connected by the power source” does not clearly define whether the conducive section is connected to the counter electrode, to the second pole, or merely held a the same potential as the counter electrode. Furthermore, the phrase “at least one conductive sections” is unclear if the phrase means singular or plural. A clarifying amendment would be “at least one conductive section.” Claim 6 The phrase “the value” lacks clear antecedent basis. It is unclear if the value is the air quality or another entity. Claim 7 The phrase the phrase “at least one conductive sections” is unclear if the phrase means singular or plural. A clarifying amendment would be “at least one conductive section.” The phrase “in particular” in line 7 renders the claim indefinite because it is unclear if the claim includes elements not actually disclosed (those encompassed by “in particular”). The phrase “the line” in line 7 of the claim lacks antecedent basis. It is unclear if it should map to “an electrical line” cited in line 3 of the claim. Claim 14 and Claim 15 The phrase “in particular” in lines 1 and 15 render the claim indefinite because it is unclear if the claim includes elements not actually disclosed (those encompassed by “in particular”). Allowable Subject Matter Claims 1-16 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. The closest prior art is McKinney US Patent 9,797,864 who teaches an electrically enhanced air filtration system having an upstream ionization array 22, a downstream media filter 28, and a conductive surface 36 located at the media filter (column 2 lines 38- 57). McKinney further teaches monitoring an ionization current, comparing a difference between those currents to a predetermined range, and either shutting down or restarting the system if a leak is detected (column 2 line 55 – column 3 line 4). Ma US Patent 8,597,405 teaches a self-cleaning electret filter having a conductive material over an electret material, wherein a charge generator may apply charge to the conductive material to repel particles from the filter (abstract). Ma also teaches using a switch to control frequency, intensity, and duration of the cleaning charge. However, Ma’s cleaning charge is applied to repel collected particles from an electret surface, not to connect a filter conductive section to an ionizer counter electrode to reactivate the filter charge. Eberle US20230166271 teaches a device comprising a first air treatment device; an ionizer including an electrode; and wherein a counter-electrode of the ionizer is electrically conductively connected to the first air treatment device. However, Eberle does not teach operating the system in a successive regular and reactivation modes in which a conductive section of the filter is connected to the counter electrode during reactivation and disconnected during regular operation. In Eberle, the air-treatment device and counter-electrode connection is a fixed integration used to reduce installation space and is not a switchable filter-reactivation arrangement. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to SHARON PREGLER whose telephone number is (571)270-5051. The examiner can normally be reached Monday - Friday 9am - 5pm. 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, In Suk Bullock can be reached at (571) 272-5954. 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. /SHARON PREGLER/ Primary Examiner, Art Unit 1772
Read full office action

Prosecution Timeline

Jul 11, 2024
Application Filed
Jul 11, 2024
Response after Non-Final Action
Aug 10, 2026
Non-Final Rejection mailed — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12723806
SYSTEM AND METHOD FOR REMOVING NATURAL GAS LIQUIDS FROM RICH GAS
2y 0m to grant Granted Sep 01, 2026
Patent 12714958
COMPOSITE FOR AIR PURIFICATION, METHOD OF MANUFACTURING THE SAME, AND FILTER INCLUDING THE SAME
3y 8m to grant Granted Aug 25, 2026
Patent 12702947
MULTI-STAGE DIRECT CAPTURE OF CO2 FROM AIR
2y 9m to grant Granted Aug 11, 2026
Patent 12702965
CARBON SORBENT-AZOBENZENE HYBRIDS FOR CARBON CAPTURE AND METHODS OF PRODUCING AND/OR USING SAID HYBRIDS
2y 8m to grant Granted Aug 11, 2026
Patent 12691402
A METHOD FOR REMOVING CO2 FROM A CO2-CONTAINING STREAM
2y 8m to grant Granted Jul 28, 2026
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
78%
Grant Probability
99%
With Interview (+21.1%)
2y 7m (~4m remaining)
Median Time to Grant
Low
PTA Risk
Based on 899 resolved cases by this examiner. Grant probability derived from career allowance rate.

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