diff --git a/app/controllers/admin/AssetsController.php b/app/controllers/admin/AssetsController.php
index f7fea069c12f..e0f3fe6bf409 100644
--- a/app/controllers/admin/AssetsController.php
+++ b/app/controllers/admin/AssetsController.php
@@ -189,10 +189,10 @@ public function postEdit($assetId = null)
 
 		// Declare the rules for the form validation
 		$rules = array(
-		'name'   => 'required|min:3',
-		'asset_tag'   => 'required|min:3',
+		'name'   => 'required|alpha_dash|min:3',
+		'asset_tag'   => 'required|alpha_dash|min:3',
 		'model_id'   => 'required',
-		'serial'   => 'required|min:3',
+		'serial'   => 'required|alpha_dash|min:3',
 		'warranty_months'   => 'integer|min:1',
     	);
 
diff --git a/app/models/Asset.php b/app/models/Asset.php
index 43dd6150e1dc..a3f58192ad2e 100644
--- a/app/models/Asset.php
+++ b/app/models/Asset.php
@@ -8,9 +8,8 @@ class Asset extends Elegant {
 		'name'   => 'required|alpha_dash|min:3',
 		'asset_tag'   => 'required|min:3|unique:assets',
 		'model_id'   => 'required',
-		'serial'   => 'required|min:3',
+		'serial'   => 'required|alpha_dash|min:3',
 		'warranty_months'   => 'integer|min:1',
-		'purchase_cost'   => 'integer|min:1',
     );
 
 
@@ -113,6 +112,15 @@ public function warrantee_expires()
 			date_add($date, date_interval_create_from_date_string($this->warranty_months.' months'));
 			return date_format($date, 'Y-m-d');
 
+	}
+
+	 public function months_until_depreciated()
+	{
+
+			$date = date_create($this->purchase_date);
+			date_add($date, date_interval_create_from_date_string($this->depreciation()->months.' months'));
+			return date_format($date, 'Y-m-d');
+
 	}
 
 	public function depreciation()