diff --git a/IPython/nbconvert/exporters/html.py b/IPython/nbconvert/exporters/html.py
index d752148..88fae5f 100644
--- a/IPython/nbconvert/exporters/html.py
+++ b/IPython/nbconvert/exporters/html.py
@@ -12,8 +12,6 @@
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode, List
-
 from IPython.nbconvert import preprocessors
 from IPython.config import Config
 
diff --git a/IPython/nbconvert/exporters/latex.py b/IPython/nbconvert/exporters/latex.py
index e0310b2..2ee5a44 100644
--- a/IPython/nbconvert/exporters/latex.py
+++ b/IPython/nbconvert/exporters/latex.py
@@ -16,7 +16,7 @@
 import os
 
 # IPython imports
-from IPython.utils.traitlets import Unicode, List
+from IPython.utils.traitlets import Unicode
 from IPython.config import Config
 
 from IPython.nbconvert import filters, preprocessors
diff --git a/IPython/nbconvert/exporters/markdown.py b/IPython/nbconvert/exporters/markdown.py
index 220b3ea..28708ae 100644
--- a/IPython/nbconvert/exporters/markdown.py
+++ b/IPython/nbconvert/exporters/markdown.py
@@ -13,7 +13,6 @@
 #-----------------------------------------------------------------------------
 
 from IPython.config import Config
-from IPython.utils.traitlets import Unicode
 
 from .templateexporter import TemplateExporter
 
diff --git a/IPython/nbconvert/exporters/python.py b/IPython/nbconvert/exporters/python.py
index cd3880d..5c7dbf4 100644
--- a/IPython/nbconvert/exporters/python.py
+++ b/IPython/nbconvert/exporters/python.py
@@ -12,8 +12,6 @@
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode
-
 from .templateexporter import TemplateExporter
 
 #-----------------------------------------------------------------------------
diff --git a/IPython/nbconvert/exporters/rst.py b/IPython/nbconvert/exporters/rst.py
index 3f7704e..eaae267 100644
--- a/IPython/nbconvert/exporters/rst.py
+++ b/IPython/nbconvert/exporters/rst.py
@@ -12,7 +12,6 @@
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode
 from IPython.config import Config
 
 from .templateexporter import TemplateExporter
diff --git a/IPython/nbconvert/exporters/slides.py b/IPython/nbconvert/exporters/slides.py
index 428c7f4..8f4545e 100644
--- a/IPython/nbconvert/exporters/slides.py
+++ b/IPython/nbconvert/exporters/slides.py
@@ -12,8 +12,6 @@
 # Imports
 #-----------------------------------------------------------------------------
 
-from IPython.utils.traitlets import Unicode
-
 from IPython.nbconvert import preprocessors
 from IPython.config import Config