PATENT CLAIM ANALYSIS

Application Number: 16427437
Application Type: Utility
Filing Date: 2019-05
Publication Date: 2019-09
Patent Classification: ["423", "625000"]

Abstract:
A process for producing metastable nanocrystalline alpha-alumina (α-Al 2 O 3 ) having particle sizes smaller than 12 nm. Starting crystallites of α-Al 2 O 3  having a particle size larger than 12 nm, typically on the order of about 50 nm, are ball-milled at low temperatures to produce a nanocrystalline α-Al 2 O 3  powder having a particle size of less than 12 nm, i.e., below the theoretical room temperature thermodynamic size limit at which α-Al 2 O 3  changes phase to γ-Al 2 O 3 , wherein the powder remains in the α-Al 2 O 3  phase at all times.

Claim (Index 1):
A process for producing a metastable \u03b1-Al 2 O 3  nanocrystalline powder having a particle size of less than 12 nm, comprising:\n placing starting crystallites of \u03b1-Al 2 O 3  having a particle size larger than 12 nm into a ball-milling jar containing a ball-milling media; and ball-milling the \u03b1-Al 2 O 3  starting crystallites to produce a metastable ball-milled \u03b1-Al 2 O 3  nanocrystalline powder having a particle size of less than about 12 nm; wherein the ball-milling is at a low temperature configured to prevent a temperature of the starting \u03b1-Al 2 O 3  from increasing to a point at which \u03b1-Al 2 O 3  undergoes a phase change to \u03b3-Al 2 O 3 ; wherein the \u03b1-Al 2 O 3  starting crystallites and the ball-milled \u03b1-Al 2 O 3  nanocrystalline powder remain in the \u03b1-Al 2 O 3  phase at all times.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 100.0
- Lexical Diversity: 1.84746
- Patent Class: 423.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15730817', '15797359', '16038322', '15918849', '16038337']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7493774839309524
- 35 USC 102 Novelty (BERT): 0.5499305215829349
- Combined Prediction Score: 0.7294327876961507
- Mean Citation Score: 226.75696800000003
- Max Citation Score: 407.32895
- Similarity Product: 349.23267356805513

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

Dataset: test