Prosecution Insights
Last updated: April 19, 2026
Application No. 18/548,274

ELECTROCHEMICAL NITROGEN AND PHOSPHORUS REMOVAL DEVICE AND METHOD

Non-Final OA §112
Filed
Aug 29, 2023
Examiner
BREWSTER, HAYDEN R
Art Unit
1779
Tech Center
1700 — Chemical & Materials Engineering
Assignee
BEIJING DRAINAGE GROUP CO., LTD
OA Round
1 (Non-Final)
61%
Grant Probability
Moderate
1-2
OA Rounds
3y 6m
To Grant
99%
With Interview

Examiner Intelligence

Grants 61% of resolved cases
61%
Career Allow Rate
327 granted / 534 resolved
-3.8% vs TC avg
Strong +50% interview lift
Without
With
+50.4%
Interview Lift
resolved cases with interview
Typical timeline
3y 6m
Avg Prosecution
32 currently pending
Career history
566
Total Applications
across all art units

Statute-Specific Performance

§101
1.4%
-38.6% vs TC avg
§103
42.4%
+2.4% vs TC avg
§102
17.9%
-22.1% vs TC avg
§112
31.0%
-9.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 534 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 . 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. DETAILED NON-FINAL ACTION This is the initial Office Action (OA), on the merits, based on the 18/548,274 application filed on August 29, 2023. Claims 1-10 are pending and have been fully considered. Claims 1-4 are directed to an apparatus, and claims 6-10 are drawn to a method. Priority Receipt is acknowledged of papers submitted under 35 U.S.C. 119(a)-(d), which papers have been placed of record in the file. Information Disclosure Statement The Examiner has considered the information disclosure statements (IDS) submitted on 08/29/2023. Please refer to the signed copy of the PTO-1449 form attached herewith. Specification The abstract of the disclosure is objected to because of its length. The abstract should be narrative and limited to a single paragraph between 50 and 150 words. Applicant’s abstract contains over 200 words. The language should be clear and concise and should avoid using phrases that one can imply, such as, “The present invention discloses,” “This disclosure concerns,” “The disclosure defined by this invention,” “This disclosure describes” etc. Correction is required. See MPEP §608.01(b). Claim Objections Claims 3, 4, 6, and 7 are objected to because of the following informalities: Claim 3: In the phrase “. . . a filter material basket is movably arranged at a position, close to the water inlet pipe. . .,” the comma appears unnecessary. Claims 6 and 7 recite: “. . .a gas-water ratio of (10-20):1” The necessity for the use of parentheses is unclear. Claim 7 recites: “. . .preferably, the second power supply has a working voltage of 12-36V when water is fed to the three-dimensional electro-biological coupling unit reactor, and the second power supply has a protection voltage of 5-12 V when the water is not fed to the three-dimensional electro-biological coupling unit reactor; . . .” The formatting for the stated voltages is inconsistent. Whichever is used it should also be consistent with the other claims. Claim 4 depends on claim 3. Appropriate correction is required. 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 1-10 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 pre-AIA the applicant regards as the invention. Due to the structure of portions of claim 1, it is unclear how all the various components are connected. The structure which goes to make up the apparatus must be clearly and positively specified and must be organized and correlated in such a manner as to present a complete operative device. For example, claim 1 recites: “. . .a main water inlet pipe, the three-dimensional electro-catalytic oxidation unit reactor, the three-dimensional electro-biological coupling unit reactor and the light filter material filter unit reactor are sequentially connected; . . .” Also, although one may assume that the connection sequence is the order in which the components are recited, this is not clearly stated. Also, in the phrase “. . . a water outlet pipe of the three-dimensional electro-flocculation phosphorus removal unit reactor is connected to a water inlet pipe of the light filter material filter unit reactor through a reflux pump and a check valve; . . .” it is unclear exactly how the structures are connected such as whether a reflux pump precedes a check valve or vice versa. Claim 5 has a similar issue with respect to these structures. In claim 3, the meaning of “. . . a water outlet pipe of the three-dimensional electro-catalytic oxidation unit reactor and the water inlet pipe of the three-dimensional electro-catalytic oxidation unit reactor are arranged diagonally . . .,” “. . . a water outlet pipe of the three-dimensional electro-biological coupling unit reactor and the water inlet pipe of the three-dimensional electro-biological coupling unit reactor are arranged diagonally . . .,” and “. . . the water outlet pipe of the light filter material filter unit reactor and the water inlet pipe of the light filter material filter unit reactor are arranged diagonally . . .” is unclear. Does this mean the respective pipes cross each other in a diagonal pattern, or that one pipe is situated diagonally across from the other? The drawings do not appear to show any diagonal pipe pattern. In claim 5, the meaning of starting the various reactors is unclear. Claim 7 refers to a procedure for starting the three-dimensional electro-biological coupling unit reactor, but the starting step is not clear in claim 5. Also, there is no mention of how to ‘start’ the other reactors. Claim 5 recites the limitation "the first power supply, the second power supply and the third power supply." There is insufficient antecedent basis for these limitations in the claim because the first mention of power supplies is in claim 3, but claim 5 references claim 1. Claim 10 which depends on claim 5, also recites the above-noted phrases. Claims 6 and 7 refer to a gas-water ratio of (10-20):1, but the source of the gas is unclear. Claims 2-4 and 6-10 depend on claims 1 and 5. Conclusion Examiner did not apply prior art at this time. Examiner recommends that Applicant carefully review all objections/rejections before responding to this office action to properly advance the case in light of the pertinent objections/rejections. Examiner further recommends that for any substantive claim amendments made in response to this Office Action, or to otherwise advance prosecution, or for any remarks concerning support for added subject matter or claim priority, that Applicant include either a pinpoint citation to the original Specification (i.e. page and/or paragraph and/or line number and/or figure number) to indicate where Applicant is drawing support for such amendment or remarks, or a clear explanation indicating why the particular limitation is implicit or inherent to the original disclosure. Electronic Inquiries Any inquiry concerning this communication or an earlier communications from the examiner should be directed to Hayden Brewster whose telephone number is (571) 270-1065. The examiner can normally be reached M-Th 9 AM - 4 PM. Alternatively, to contact the examiner, Applicant may send a communication, via e-mail or fax. Examiner’s direct fax number is: (571) 270-2065. Examiner's official e-mail address is: "Hayden.Brewster@uspto.gov." However, since e-mail communication may not be secure, Examiner will not respond to a substantive e-mail unless Applicant’s communication is in accordance with the provisions of MPEP §502.03 & related sections that discuss the required Authorization for Internet Communication (AIC). Nonetheless, all substantive communications will be made of record in Applicant’s file. To facilitate the Internet communication authorization process, Applicant may file an appropriate letter, or may complete the USPTO SB439 fillable form available at https://www.uspto.gov/sites/default/files/documents/sb0439.pdf, preferably in advance of any substantive e-mail communication. Since one may use an electronic signature with this particular form, Applicant is encouraged to file this form via the Office’s system for electronic filing of patent correspondence (i.e., the electronic filing system (Patent Center)). Otherwise, a handwritten signature is required. In addition to Patent Center, Applicant can submit their Internet authorization request via US Postal Service, USPTO Customer Service Window, or Central Fax. Examiner can also provide a one-time oral authorization, but this will only apply to video conferencing. It is improper to request Internet Authorization via e-mail. Examiner interviews are available via telephone, in-person, and via 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) form available at http://www.uspto.gov/interviewpractice, or Applicant may call Examiner, if preferable. Applicant can access a general list of patent application forms at either https://www.uspto.gov/patent/forms/forms-patent-applications-filed-or-after-september-16-2012 (applications filed on or after September 16, 2012) or https://www.uspto.gov/patent/forms/forms (applications filed before September 16, 2012). Note that the language in an AIR form is not a substitute for the requirements of an AIC, where appropriate. The mere filing of an Applicant Initiated Interview Request Form (PTOL-413A) or a Letter Requesting Interview with Examiner, in EFS-Web, may not apprise Examiner of such a request in a timely manner. If attempts to reach the Examiner are unsuccessful, Applicant may reach Examiner’s supervisor, Bobby Ramdhanie at 571-270-3240. The central 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. /HAYDEN BREWSTER/Examiner, AU 1779
Read full office action

Prosecution Timeline

Aug 29, 2023
Application Filed
Dec 23, 2025
Non-Final Rejection — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12589340
Rotary filter and associated filtering method
2y 5m to grant Granted Mar 31, 2026
Patent 12590016
FILTERING CONTAINER FOR LIQUIDS
2y 5m to grant Granted Mar 31, 2026
Patent 12583953
Method for Separating Polyisoprene and Other Apolar Valuable Substances from Vegetable Feedstock
2y 5m to grant Granted Mar 24, 2026
Patent 12577137
PROCESS FOR WATER TREATMENT USING IMMERSED GAS TRANSFER MEMBRANES
2y 5m to grant Granted Mar 17, 2026
Patent 12565635
Method Of Operation of a Perfusion System
2y 5m to grant Granted Mar 03, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

AI Strategy Recommendation

Get an AI-powered prosecution strategy using examiner precedents, rejection analysis, and claim mapping.
Powered by AI — typically takes 5-10 seconds

Prosecution Projections

1-2
Expected OA Rounds
61%
Grant Probability
99%
With Interview (+50.4%)
3y 6m
Median Time to Grant
Low
PTA Risk
Based on 534 resolved cases by this examiner. Grant probability derived from career allow 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