Prosecution Insights
Last updated: October 01, 2026
Application No. 18/565,957

CELL-FREE REGIONS BY LABEL-FREE MAGNETIC EXCLUSION

Non-Final OA §103
Filed
Nov 30, 2023
Priority
Jun 01, 2021 — provisional 63/202,208 +1 more
Examiner
LANKFORD JR, LEON B
Art Unit
1633
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Mcmaster University
OA Round
1 (Non-Final)
70%
Grant Probability
Favorable
1-2
OA Rounds
10m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 70% — above average
70%
Career Allowance Rate
526 granted / 751 resolved
+10.0% vs TC avg
Strong +32% interview lift
Without
With
+31.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 8m
Avg Prosecution
43 currently pending
Career history
772
Total Applications
across all art units

Statute-Specific Performance

§101
6.5%
-33.5% vs TC avg
§103
43.2%
+3.2% vs TC avg
§102
14.4%
-25.6% vs TC avg
§112
26.7%
-13.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 751 resolved cases

Office Action

§103
DETAILED ACTION 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 . Election/Restrictions Applicant’s election without traverse of Group I in the reply filed on 6/26/26 is acknowledged. 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. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claims 1-3, 5-10, 12-13 & 15-20 are rejected under 35 U.S.C. 103 as being unpatentable over US20190127685A1 (FATTAH et al.) and TIMM et al., Scientific Reports, 21 October 2013 (21-10-2013), Vol. 3, Document 3000, pp. 1-8. Fattah teaches a method a label-free method to generate three dimensional cellular patterns using magnetic manipulation (abstract). The method comprises suspending cells in a paramagnetic culture medium comprising gadolinium, wherein the cells are diamagnetic and create a magnetic susceptibility difference (abstract; [0005], [0011], [0014]). The cells and culture medium are seeded into microwell plates and are placed over an array of magnet pairs, wherein each magnet pair creates a magnetic field gradient ([0012-0013]; Fig. 6). The magnetic susceptibility difference and the magnetic field gradient drive cells towards a spaced region between the magnets in the magnet pair having the lowest magnetic field strength to create a cellular aggregate, wherein cell-free areas are present ([0007-0011]; Fig 6). Different cellular aggregate shapes may be produced depending on the placement of the magnets (Fig. 4). D1 further discloses that the paramagnetic culture medium contains salts (paragraph [0069]) and discloses the use of ECM coated microwell plate surfaces (paragraph [0082]). Fatta further teaches the use of the cellular aggregates SO produced in drug discovery screening and cell signaling assays [0058-0064]. It would be obvious at the time the invention was filed to generate ring-shaped cellular aggregates because Fattah teaches that different placement of magnet pairs can be used to generate different shapes of cellular aggregates. Fattah teaches using their cellular aggregates in drug discovery screening and cell signaling assays. Fattah does not specify the generation of cellular aggregates with a cell-free area wherein the cellular aggregate surrounds the cell-free area and does not specify the corresponding use of a magnet pair that comprises an outer magnet and an inner magnet wherein the cellular aggregate is formed in the spaced region between the magnets. It would have been obvious at the time the invention was field to use magnetic patterning to generate cellular aggregates in the form of rings, i.e. comprising a cell-free-area wherein the cellular aggregate surrounds the cell-free arca, for use in cellular migration assays and toxicity screening because Timm teaches using magnetic patterning to generate cellular aggregates in the form of rings, i.e. comprising a cell-free-area wherein the cellular aggregate surrounds the cell-free area, for use in cellular migration assays and toxicity screening (whole document). Applicant is directed to pages 12-13 of KSR v Teleflex (500 US 398 2007) “ … the Court has held that a “patent for a combination which only unites old elements with no change in their respective functions . . . obviously withdraws what is already known into the field of its monopoly and diminishes the resources available to skillful men.” Great Atlantic & Pacific Tea Co. v. Supermarket Equipment Corp., 340 U. S. 147, 152 (1950). This is a principal reason for declining to allow patents for what is obvious. The combination of familiar elements according to known methods is likely to be obvious when it does no more than yield predictable results.” “When a work is available in one field of endeavor, design incentives and other market forces can prompt variations of it, either in the same field or a different one(emphasis added). If a person of ordinary skill can implement a predictable variation, §103 likely bars its patentability. For the same reason, if a technique has been used to improve one device, and a person of ordinary skill in the art would recognize that it would improve similar devices in the same way, using the technique is obvious unless its actual application is beyond his or her skill.” "[W]here the general conditions of a claim are disclosed in the prior art, it is not inventive to discover the optimum or workable ranges by routine experimentation." In re Aller, 220 F.2d 454, 456, 105 USPQ 233, 235 (CCPA 1955) (Claimed process which was performed at a temperature between 40°C and 80°C and an acid concentration between 25% and 70% was held to be prima facie obvious over a reference process which differed from the claims only in that the reference process was performed at a temperature of 100°C and an acid concentration of 10%.); >see also Peterson, 315 F.3d at 1330, 65 USPQ2d at 1382 ("The normal desire of scientists or artisans to improve upon what is already generally known provides the motivation to determine where in a disclosed set of percentage ranges is the optimum combination of percentages.");< ** In re Hoeschele, 406 F.2d 1403, 160 USPQ 809 (CCPA 1969) (Claimed elastomeric polyurethanes which fell within the broad scope of the references were held to be unpatentable thereover because, among other reasons, there was no evidence of the criticality of the claimed ranges of molecular weight or molar proportions.). For more recent cases applying this principle, see Merck & Co. Inc. v. Biocraft Laboratories Inc., 874 F.2d 804, 10 USPQ2d 1843 (Fed. Cir.), cert. denied, 493 U.S. 975 (1989); In re Kulling, 897 F.2d 1147, 14 USPQ2d 1056 (Fed. Cir. 1990); and In re Geisler, 116 F.3d 1465, 43 USPQ2d 1362 (Fed. Cir. 1997). Accordingly, the claimed invention was prima facie obvious to one of ordinary skill in the art at the time the invention was filed especially in the absence of evidence to the contrary. Any inquiry concerning this communication or earlier communications from the examiner should be directed to BLAINE LANKFORD whose telephone number is (571)272-0917. The examiner can normally be reached M-Th 8-6:30. 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, Louise Humphrey can be reached at 571-272-5543. 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. BLAINE LANKFORD Examiner Art Unit 1657 /BLAINE LANKFORD/Primary Examiner, Art Unit 1657
Read full office action

Prosecution Timeline

Nov 30, 2023
Application Filed
Sep 03, 2026
Non-Final Rejection mailed — §103 (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
70%
Grant Probability
99%
With Interview (+31.6%)
3y 8m (~10m remaining)
Median Time to Grant
Low
PTA Risk
Based on 751 resolved cases by this examiner. Grant probability derived from career allowance rate.

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