Prosecution Insights
Last updated: April 19, 2026
Application No. 18/561,850

METHOD AND SYSTEM FOR FLAME PHOTOMETRIC ONLINE DETECTION OF SULFUR-CONTAINING COMPOUND CONTENT IN NATURAL GAS

Non-Final OA §112
Filed
Nov 17, 2023
Examiner
RAEVIS, ROBERT R
Art Unit
2855
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Petrochina Company Limited
OA Round
1 (Non-Final)
83%
Grant Probability
Favorable
1-2
OA Rounds
2y 9m
To Grant
99%
With Interview

Examiner Intelligence

Grants 83% — above average
83%
Career Allow Rate
1543 granted / 1857 resolved
+15.1% vs TC avg
Strong +16% interview lift
Without
With
+15.6%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
73 currently pending
Career history
1930
Total Applications
across all art units

Statute-Specific Performance

§101
1.7%
-38.3% vs TC avg
§103
41.2%
+1.2% vs TC avg
§102
5.9%
-34.1% vs TC avg
§112
37.2%
-2.8% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1857 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 . Objection to Specification The disclosure is objected to because of the following informalities: The “3” (line 3, Para 110 of Publication) should be - - 43 - -; the “43” (line 4, Para 110 of Publication) should be - - 44 - - ). Appropriate correction is required. Rejection under 35 USC 112(b) Claims 1-2, 4, 6-7, 9, 11-18, 20-23, 25, 27 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, lines 7-9 are confusing, as it’s not clear what comprises (“comprising”) the boiling point and sulfur columns. Is it the “system” (line 7) or is it “the chromatographic column” (lines 7-8)? The first comma on line 8 may be part (but not all) of the difficulty. As to claim 1, it not clear how many columns are in this claim. It seems to call for 3 “chromatographic column” (line 8), “boiling point column” (line 8) and “sulfur column” (line 8). The specification and drawings may very well have a total of 2 columns; as such, the claim is inconsistent with the specification and drawings. As to claim 1, the commas (line 8) add breaks, which make the entire “wherein” (line 7) clause uncertain. What “is provided in the chromatographic column system” (lines 8-9)? Is it the “a chromatographic column”, boiling point column or sulfur column, or some combination thereof? As to claim 1, lines 13 to last refer to many pipelines, but is seems that the same structure is potentially claimed twice as some of those many connecting pipelines may overlap with others, especially in regard to the “a switchable pipeline” which certainly drags in the single 10 port valve on several occasions. Remember, the claim is overlapping pipelines. Maybe (only maybe) those pipelines should be passages, as passages might potentially could potentially overlap other passages. As to claim 1, what is the meaning of a pipeline? Is such truly a pipe section? Do the claimed pipelines include any portion of the 10 way multi valve? Such would result in the same structure being claim twice. Are each of the many individually claimed “a switchable connecting pipeline’s identifiably as individual components? Do any 2 of the “switchable connecting pipeline’s include the same single switching valve (even, the chromatographic column system in its entirety)? After all, they are claimed as such. If so, the same structure is being claimed twice, which is problematic. As to claim 1, lines 12-13 are not consistent with the figures. Consider that only sample exits the depressurization system, and that same sample is never directly input into boiling point column 41 as shown in Figure 4B. The output port of the depressurization system is only in communication with the “sample input” and “sample output” (in each of Figures 4A and 4B), and as such never connected to column 40. As to claim 1, lines 16-17 are not consistent with each of lines 12-13 and 14-15. Consider lines 12-13 and 14-15 are only directed to Figure 4A valve position, while lines 18-19 are only directed to Figure 4B valve position, suggestive of different times; yet each of those wherein clauses (“are each connected”, line 15; “is in communication”, line 16; “is in communication”, line 18) “suggests that is an existing fluid passage at the same time. This claim is not consistent with the drawings. As to claim 1, the last 2 lines are not consistent with the drawings. Consider that those last 3 lines suggests that the outputs of both columns 40 and 41 ae fluidly connected to the detector 14 when they never are in the drawings. As to claim 1, the system is confusing because it suggests all of lines 12-last occur at the same time, when they do not. The disclosure/figures describe an apparatus where different components may be configured to do something or other, maybe even connectable; but the claim suggests that all is occurring through “a switchable connecting pipeline” Prior art cited, but not Applied The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Guo et al CN 103471877 (listed 1449) teaches a system including a sampling line 2 that samples from a natural gas line 1, and passes the sample to a processing device 2 and preprocessing device 29 (decompression adjustor valve 14), and then finally on to a chromatograph 36 and detector. Carrier gas source 35 is employed to operate the chromatograph. However, the system does not suggest employing separate boiling and sulfur columns in combination with particularly claimed piping limitations of Applicant’s claim 1. Zhou et al CN 10407075 (listed 1449) teaches a system including a line that passes sample containing sulfur to a 10 port sample valve, which valve passes fluid to 2 chromatograph columns and detectors 7,8. However, such does not suggest separate boiling and sulfur columns with the particularly claimed fluid connections as called for in Applicant’s claim 1. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to ROBERT R RAEVIS whose telephone number is (571)272-2204. The examiner can normally be reached on Monday to Friday from 8am to 5pm. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Kristina DeHerrera, can be reached at telephone number 303-297-4237. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from Patent Center. Status information for published applications may be obtained from Patent Center. Status information for unpublished applications is available through Patent Center to authorized users only. Should you have questions about access to the USPTO patent electronic filing system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). Examiner interviews are available via a variety of formats. See MPEP § 713.01. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) Form at https://www.uspto.gov/InterviewPractice. /ROBERT R RAEVIS/ Primary Examiner, Art Unit 2855
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Prosecution Timeline

Nov 17, 2023
Application Filed
Jan 11, 2026
Non-Final Rejection — §112 (current)

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Prosecution Projections

1-2
Expected OA Rounds
83%
Grant Probability
99%
With Interview (+15.6%)
2y 9m
Median Time to Grant
Low
PTA Risk
Based on 1857 resolved cases by this examiner. Grant probability derived from career allow rate.

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