PATENT CLAIM ANALYSIS

Application Number: 15757343
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-09
Patent Classification: ["029", "592100"]

Abstract:
A carburized La 2 O 3  and Lu 2 O 3  co-doped Mo filament cathode and its fabrication method, which belongs to the technical field of rare earth-refractory metal cathodes. The rare earth oxides are La 2 O 3  and Lu 2 O 3 , and the total concentration of rare earth oxides ranges from 2.0-5.0 wt. %. The La 2 O 3  and Lu 2 O 3  co-doped molybdenum oxide powers are prepared by Sol-Gel method. La 2 O 3  and Lu 2 O 3  co-doped Mo powers are prepared by two calcining steps. Then pressing and sintering the mixed powders to obtain the molybdenum rods; operating mechanical and heat processes of the molybdenum rods to obtain molybdenum filament. Operating electrolytic cleaning, straightening, winding modeling and cutting treatments with Mo filament to obtain the un-carburized La 2 O 3  and Lu 2 O 3  co-doped Mo cathode. And then carburize the filament cathode at a high temperature for a short time to obtain a cathode with high carburization degree. And then operate the out-gassing treatment and activation treatment with the cathode at a high temperature to obtain an environmental and non-radioactive cathode with good emission current and emission stability.

Claim (Index 5):
A method of manufacturing a La 2 O 3  and Lu 2 O 3  co-doped molybdenum filament cathode material, comprising:\n (1) mixing the solutions of Lu(NO 3 ) 3 .6H 2 O, La(NO 3 ) 3 .6H 2 O, (NH 4 ) 6 Mo 7 O 24 .4H 2 O and citric acid with persistently agitation and setting the mixed solution in water bath to obtain a wet gel; the weight ration of Lu(NO 3 ) 3 .6H 2 O, La(NO 3 ) 3 .6H 2 O and (NH 4 ) 6 Mo 7 O 24 .4H 2 O is determined by the weight ratio of Mo, La 2 O 3  and Lu 2 O 3 ; the weight ratios of (NH 4 ) 6 Mo 7 O 24 .4H 2 O and citric acid is 1:(0.8-1.5); drying the wet gel to obtain the xerogel and then calcining the xerogel at 500-680\u00b0 C. to obtain La 2 O 3  and Lu 2 O 3  co-doped MoO 3  mixed powers; (2) the La 2 O 3 , Lu 2 O 3  and MoO 3  mixed powders obtained by claim ( 1 ) are calcined by two steps in hydrogen atmosphere; first step is calcining the La 2 O 3 , Lu 2 O 3  and MoO 3  mixed powders in hydrogen atmosphere at the temperature ranges from 500 to 680\u00b0 C. to obtain La 2 O 3 , Lu 2 O 3  doped MoO 2  powders thoroughly; then the second step is calcining the La 2 O 3 , Lu 2 O 3  doped MoO 2  powders further in hydrogen atmosphere at 800-980\u00b0 C. to obtain La 2 O 3  and Lu 2 O 3  doped Mo powders completely; (3) pressing and sintering the La 2 O 3  and Lu 2 O 3  doped Mo powders to obtain the molybdenum rods at the sintering temperature between 1800 to 2030\u00b0 C.; (4) operating further treatments of the La 2 O 3  and Lu 2 O 3  co-doped molybdenum rods prepared by claim ( 3 ) to obtain the un-carburized La 2 O 3  and Lu 2 O 3  co-doped molybdenum filament cathode, comprising: rotary swaging treatment, drawing treatment, electrolytic cleaning treatment, straightening treatment, winding treatment, modeling treatment and cutting treatment; (5) assembling of the un-carburized La 2 O 3  and Lu 2 O 3  co-doped molybdenum filament cathode prepared by claim ( 4 ) and then carburizing the La 2 O 3  and Lu 2 O 3  co-doped Mo filament cathode; the temperature of carburization treatment of the present invention ranges from 1550 to 1900\u00b0 C. for 60-150 s, and the carburization degree of the present invention is about 10-50%.

Metadata:
- Claim Count in Document: 4.0
- Percentile: 90.0
- Lexical Diversity: 2.29032
- Patent Class: 29.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14218680', '13512755', '11049598', '10378945', '13254860']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8677301824425814
- 35 USC 102 Novelty (BERT): 0.5446699643497036
- Combined Prediction Score: 0.8354241606332936
- Mean Citation Score: 236.723218
- Max Citation Score: 413.81924
- Similarity Product: 311.44527434847834

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

Dataset: test