The spelling of the word "patchen" can be explained using the IPA phonetic transcription. The /p/ sound is made by pressing your lips together and then releasing them. The /æ/ sound is made by opening your mouth widely and making a short vowel sound. The /tʃ/ sound is made by placing your tongue against the roof of your mouth and releasing air while making a "ch" sound. The /ən/ sound is made by making a short "uh" sound and adding the /n/ consonant sound at the end. Therefore, the correct spelling of this word is "patchen".