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Table 2 The number of patents listed in the K-Orange Book per drug sorted by approval year

From: Patenting and patent challenges in South Korea after introducing a patent linkage system

Approval year

2012

2013

2014

2015

2016

2017

2018

2019

Total

Number of drugs (N)

68

100

107

112

99

89

36

48

659

 Mean

1.72

2.10

1.90

1.80

1.85

1.84

1.69

2.00

1.87

 Standard deviation

1.26

1.61

1.09

0.94

1.04

1.52

0.74

1.36

1.24

Drug type

 Chemical

1.77

2.01

1.92

1.78

1.88

1.65

1.83

1.84

1.84

 Biologic

1.37

2.90

1.86

1.91

1.67

2.80

1.14

2.55

2.08

Statutory exclusivity

 No

1.79

2.11

1,78

1.58

1.59

1.55

1.40

2.00

1.76

 Yes

1.68

2.09

2.00

1.97

1.96

2.08

1.74

2.00

1.96

Manufacturer type

 Domestic

1.31

1.27

1.11

1.38

1.43

1.51

1.38

1.12

1.33

 Foreign

1.91

2.75

2.17

2.01

2.09

2.10

1.79

2.44

2.17

Administration

 Oral

1.91

2.05

2.01

1.88

1.89

1.68

1.76

1.80

1.90

 Injection

1.38

2.56

1.85

1.93

1.81

2.29

1.25

2.55

1.98

 Others

1.44

1.62

1.30

1.25

1.73

1.67

2.33

2.00

1.56

ATC classification

 J/L

1.58

3.22

2.03

2.15

1.96

2.15

1.71

3.00

2.18

 A/B/C

1.90

1.40

1.81

1.65

1.79

1.80

1.71

2.11

1.72

 M/N

1.67

2.39

2.07

1.87

1.80

1.40

1.00

1.28

1.85

 Other

1.50

2.33

1.54

1.21

1.90

1.44

2.00

1.88

1.74