PATENT CLAIM ANALYSIS

Application Number: 15991590
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2019-05
Patent Classification: ["423", "179500"]

Abstract:
Disclosed is a method of producing high-purity lithium carbonate from low-purity crude lithium carbonate. The method includes: (a) producing crude lithium carbonate slurry by mixing crude lithium carbonate having a polycrystalline state and a size of 20 to 200 μm with water; (b) carbonating and dissolving the crude lithium carbonate slurry; (c) performing primary solid-liquid separation to obtain a filtrate; (d) adding soluble barium salts to the filtrate to deposit barium sulfate; (e) performing secondary solid-liquid separation for the filtrate containing the deposited barium sulfate to obtain a filtrate; (f) mixing lithium carbonate seed crystals with the filtrate obtained from the secondary solid-liquid separation and precipitating lithium carbonate dissolved in the filtrate on surfaces of the lithium carbonate seed crystals to produce high-purity lithium carbonate slurry containing high-purity lithium carbonate by controlling a particle size; and (g) carbonating the high-purity lithium carbonate slurry to produce high-purity lithium carbonate.

Claim (Index 4):
The method according to  claim 3 , wherein the reaction for depositing the remaining phosphoric acid as lithium phosphate in the step (q) is performed at a temperature of 50 to 90\u00b0 C. for 20 to 120 minutes by setting a concentration of the lithium sulfate aqueous solution to 0.3 M to 2.4 M.

Metadata:
- Claim Count in Document: 23.0
- Percentile: 93.0
- Lexical Diversity: 2.47826
- Patent Class: 423.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15991388', '15240792', '14045297', '13029908', '13002591']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7715830766698524
- 35 USC 102 Novelty (BERT): 0.5797097992207555
- Combined Prediction Score: 0.7523957489249428
- Mean Citation Score: 313.928544
- Max Citation Score: 456.92264000000006
- Similarity Product: 423.758169055481

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