PATENT CLAIM ANALYSIS

Application Number: 15888241
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-06
Patent Classification: ["166", "214000"]

Abstract:
A check valve for an injection string, comprises a cylindrical house with a central bore. A piston has a piston area exposed to the central bore, a protective sleeve at one end and a contact point affixed to the piston. A return spring is arranged between the house and the contact point so as to oppose a pressure force exerted on the piston area. A flapper valve—comprises a blade rotatable about a hinge between a closed position where the blade blocks a reverse flow through the central bore and an open position where the blade is received in a recess in a wall of the central bore. The piston is axially movable within the house between a first position where the protective sleeve is displaced from the recess and a second position where the protective sleeve covers the recess.

Claim (Index 2):
The check valve according to  claim 1 , wherein the return spring is pre-tensioned in the first position to provide a return force equal to and opposite a pressure force caused by an intermediate bore pressure exerted on the piston area.

Metadata:
- Claim Count in Document: 7.0
- Percentile: 88.0
- Lexical Diversity: 2.05634
- Patent Class: 166.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['14150137', '15374326', '15888473', '12985907', '14313089']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7667443509075843
- 35 USC 102 Novelty (BERT): 0.484986577251596
- Combined Prediction Score: 0.7385685735419855
- Mean Citation Score: 190.391392
- Max Citation Score: 194.92073
- Similarity Product: 135.1717834346682

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

Dataset: test