PATENT CLAIM ANALYSIS

Application Number: 15887701
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2019-08
Patent Classification: ["429", "429000"]

Abstract:
Systems and methods for transitioning a fuel cell system between operating modes. The fuel cell system may be a SOFC system comprising Ni-containing anodes. The transitions may be from a shutdown mode to a hot standby mode, from a hot standby mode to a power ready hot standby mode, from a power ready hot standby mode to an operating mode, from an operating mode to a power ready hot standby mode, from a power ready hot standby mode to a hot standby mode, from a hot standby mode to a shutdown mode, and from an operating mode to a shutdown mode.

Claim (Index 18):
A method of transitioning a fuel cell system from a power-ready hot standby mode to a shutdown mode, the fuel cell system having a fuel cell stack comprising a plurality of solid oxide fuel cells, each fuel cell comprising an anode and a cathode spaced apart by an electrolyte, an anode loop for providing a fuel to the anodes, and a cathode loop for providing an oxidant to the cathodes, wherein the conditions of the fuel cell system in a power-ready hot standby mode include:\n an oxidant flowing through the cathode loop at a mass flow rate in the range of about 50 to 100 of a full load mass flow rate at a temperature in the range of 800 C to 1000 C; no SOFC fuel flowing into the anode loop; a transition fuel flowing from a source into the anode loop at a mass flow rate sufficient to prevent oxidation of the anode; RCB applied to the fuel cell stack; and anode fuel utilization in the range of about 35% to about 65%; and wherein the conditions of the fuel cell system in a shutdown mode include:\n an oxidant flowing through the cathode loop at a mass flow rate in the range of about 50% to 100% of a full load mass flow rate at ambient temperature; \n no SOFC fuel flowing into the anode loop; \n no transition fuel is flowing from the transition fuel source; and \n no RCB is applied to the fuel cell stack; \n said method comprising:\n maintaining flow of oxidant through the cathode loop at a mass flow rate in the range of about 50 to 100 of a full load mass flow rate; \n controlling the cool down of the fuel cell stack to ambient temperature by controlling the mass flow rate or temperature of the oxidant flowing through the cathode loop; \n maintaining flow of transition fuel into the anode loop at a mass flow rate sufficient to prevent anode oxidation during cool down of the fuel cell stack to a predetermined temperature in the range of 450 C to 700 C, then ceasing the flow of transition fuel into the anode loop when the temperature of the fuel cell stack is at the predetermined temperature; and \n maintaining the application of RCB to the fuel cell stack during cool down of the fuel cell stack to a temperature at or below the predetermined temperature, then ceasing the application of RCB to the fuel cell stack.

Metadata:
- Claim Count in Document: 71.0
- Percentile: 88.0
- Lexical Diversity: 3.54839
- Patent Class: 429.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15811290', '15333560', '15801112', '10993902', '15341376']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8793219161515656
- 35 USC 102 Novelty (BERT): 0.5066201896050132
- Combined Prediction Score: 0.8420517434969104
- Mean Citation Score: 264.966286
- Max Citation Score: 298.2686
- Similarity Product: 214.91235536564588

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