DETAILED ACTION
All outstanding objections and rejections made in the previous Office Action, and not repeated below, are hereby withdrawn.
The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior office action.
Continued Examination Under 37 CFR 1.114
A request for continued examination under 37 CFR 1.114, including the fee set forth in 37 CFR 1.17(e), was filed in this application after final rejection. Since this application is eligible for continued examination under 37 CFR 1.114, and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114. Applicant's submission filed on 1 July 2026 has been entered.
Claims 1, 2, 4, and 6-20 as amended are pending.
Claim Rejections - 35 USC § 103
Claim(s) 1, 2, 4, 6-12, and 15-20 are rejected under 35 U.S.C. 103 as being unpatentable over WO 2021/138394 A1 (“Korwin-Edson”) in view of US 2020/0148586 (“Yokota”).
As to claims 1 and 4, Korwin-Edson teaches a glass composition for forming fibers (abstract). Korwin-Edson teaches SIO2 from 57 to 62 wt %, which is within the recited range, 7 to 9 wt % CaO, which is within the recited range, 8 to 12.5 wt % MgO, which is within the recited range (abstract). Korwin-Edson teaches the glass composition includes 0.4 to 1.0 wt % LI2O, which is within the recited range.
Korwin-Edson teaches TiO2 ranging from 0.2 to 1.5 wt % (abstract), which substantially overlaps the recited range, in particular 0.5 to 0.7 wt % (para. 00062), which is within the recited range.
Korwin-Edson teaches the composition is substantially free of B2O3 (para. 00066), which meets the recited range. Korwin-Edson also teaches less than 1.0 wt % of rare earth oxides such as Y2O3, which meets the recited range (para. 00069).
Korwin-Edson does not explicitly discuss the combined content of MgO and CaO. However, the separately taught amounts of each total to a range of 15 to 21.5 wt %, which substantially overlaps the recited range. Furthermore, the exemplary embodiments include 7.9 to 9 wt % CaO (para. 00059), and 10.5 to 12.0 wt % (para. 00058), which totals to 18.4 to 21 wt %, which is within the recited range.
Korwin-Edson does not exemplify the recited amount of Al2O3. However, Korwin-Edson teaches that the amount of Al2O3 ranges from 19 to 25 wt % (abstract, para. 00057), which overlaps the recited range. Moreover, the use of Al2O3 according to Korwin-Edson in the recited range provides for 1.22 to 1.35 as the ratio of Al2O3 to the exemplary amounts of MgO and CaO combined. Korwin-Edson teaches the amount of alumina is chosen to provide high modulus without excessively increasing crystallization (para. 00057). As such, the modification of Korwin-Edson, including having Al2O3 content, and the ratio of Al2O3 to (MgO+CaO) is an obvious modification suggested by Korwin-Edson.
While not exemplified, Korwin-Edson teaches the composition includes Na2O in a range of 0.05 to 0.1 wt %, and K2O of 0.04 to 0.2 % by weight (para. 0064), and thus Korwin-Edson suggests that the composition may be adjusted to less than 0.25 wt % as required by claim 1, and less than 0.15 wt % as required by claim 4. In addition, it is known for glass fiber production, that the amount of Na2O and K2O is kept in this low range to avoid strength loss (Yokota, para. 0035). Given the teaching that the amounts of Na2O and K2O are kept low, the recited amounts of claims 1 and 4 are an obvious modification suggested by Korwin-Edson, and by Yokota to maintain fiber strength.
As to claim 2, the amount of MgO and CaO content taught by Korwin-Edson (8.0=12.5 wt % MgO and 7-9 wt % CaO) necessarily requires that the ratio of CaO/MgO is less than 1.5.
As to claim 6, Korwin-Edson teaches glass fibers formed from the glass composition (para. 00077).
As to claim 7, Korwin-Edson teaches the recited elastic (Young’s) modulus in the recited range (para. 00073).
As to claim 8, Korwin-Edson teaches a delta (actual fiber drawing temperature over liquidus) of over 60 degrees C (para. 00050), and as such, Korwin-Edson teaches its compositions can be formed with such property.
As to claim 9, Korwin-Edson teaches liquidus temperature in the recited range (para. 00048).
As to claim 10, Korwin-Edson does not discuss the melting temperature. However, given that Korwin-Edson suggests a glass fiber of the recited composition, that such resulting fibers would have the recited melting temperature.
As to claim 11, Korwin-Edson does not discuss the specific modulus measurement as recited. However, given that Korwin-Edson suggests a glass fiber of the recited composition, that such resulting fibers would have the recited specific modulus.
As to claim 12, Korwin-Edson teaches forming fiber strands (para. 00079).
As to claim 15, Korwin-Edson teaches a fabric of glass fibers (abstract).
As to claim 16, Korwin-Edson teaches that chopped fiber glass strands may be formed (para. 0002).
As to claim 17, Korwin-Edson teaches a composite product of a polymeric matrix, thus polymer material, and plurality of glass fibers (para. 00034).
As to claim 18, Korwin-Edson teaches the use of woven fabrics of glass fibers in plastics (polymers) (para. 00081).
As to claim 19, Korwin-Edson teaches the polymer of the composite material may be thermoplastic or thermosetting (para. 00082).
As to claim 20, Korwin-Edson teaches various articles, including wind blades, formed from the glass fibers (para. 00081).
Claim(s) 13 and 14 are rejected under 35 U.S.C. 103 as being unpatentable over WO 2021/138394 A1 (“Korwin-Edson”) in view of US 2020/0148586 (“Yokota”) as applied to claim 6, further in view of WO 2016/179134 A1 (“Li”).
The discussion of Korwin-Edson with respect to claim 6 is incorporated by reference.
Korwin-Edson teaches forming glass fibers, but does not discuss rovings or yarns. Li teaches similar glass fiber forming composition, and teaches that glass fiber strands can be formed into yarns and rovings (p. 13), and as such, yarns and rovings are obvious end products of glass fibers as taught by Li.
Response to Arguments
Applicant's arguments filed 1 July 2026 have been fully considered but they are not persuasive. While Korwin-Edson does not exemplify the recited amount of Al2O3, Korwin-Edson provides rationale for adjusting the amount of Al2O3, including within the recited range, as set forth above. In addition, while Korwin-Edson does not exemplify the total amount of Na2O and K2O, the broader teaching of Korwin-Edson teaches such small amounts, and Yokota teaches rationale for such low amounts of these two alkali oxides.
Conclusion
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/KREGG T BROOKS/ Primary Examiner, Art Unit 1764
