PATENT CLAIM ANALYSIS

Application Number: 16096080
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-04
Patent Classification: ["549", "250000"]

Abstract:
A method for producing an aromatic dianhydride includes reacting an aromatic diimide with a substituted or unsubstituted phthalic anhydride in an aqueous medium in the presence of an amine exchange catalyst to provide an aqueous reaction mixture including an N-substituted phthalimide, an aromatic tetraacid salt, and at least one of an aromatic triacid salt and an aromatic imide diacid salt. The method further includes removing the phthalimide from the aqueous reaction mixture by extracting the aqueous reaction mixture with an organic solvent for a first time period, at a first extraction temperature and subsequent to the first time period, extracting the aqueous reaction mixture with an organic solvent for a second time period, at a second extraction temperature. The aromatic tetraacid salt is converted to the corresponding aromatic dianhydride. Aromatic dianhydrides prepared according to the method are also described.

Claim (Index 1):
A method for producing an aromatic dianhydride, the method comprising\n reacting an aromatic diimide with a substituted or unsubstituted phthalic anhydride in an aqueous medium in the presence of an amine exchange catalyst under conditions effective to provide an aqueous reaction mixture comprising an N-substituted phthalimide, an aromatic tetraacid salt, and at least one of an aromatic triacid salt and an aromatic imide diacid salt, wherein the reacting is at a reaction temperature that is 140 to 250\u00b0 C. and a reaction pressure of 150 to 300 psig; removing the phthalimide from the aqueous reaction mixture by extracting the aqueous reaction mixture with an organic solvent for a first time period, at a first extraction temperature that is 60 to 160\u00b0 C., provided that the first extraction temperature is at least 10\u00b0 C. lower than a maximum of the reaction temperature; subsequent to the first time period, extracting the aqueous reaction mixture with an organic solvent for a second time period, at a second extraction temperature that is 140 to 250\u00b0 C., provided that the second extraction temperature is at least 5\u00b0 C. higher than the first extraction temperature; and converting the aromatic tetraacid salt to the corresponding aromatic dianhydride.

Metadata:
- Claim Count in Document: 50.0
- Percentile: 97.0
- Lexical Diversity: 2.14493
- Patent Class: 549.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['13649443', '10667820', '10454006', '15551644', '11603523']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7220559650764653
- 35 USC 102 Novelty (BERT): 0.4978580580357291
- Combined Prediction Score: 0.6996361743723918
- Mean Citation Score: 223.3783
- Max Citation Score: 241.15402000000003
- Similarity Product: 171.82420272469884

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test