In 1851, extensions for the 1837 patent and for both 1838 patents were sought by the trustees of a company previously formed by Claridge.
ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd fˈɪfti wˈʌn, ɛkstˈɛnʃənz fɚðə wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd θˈɜːɾi sˈɛvən pˈæʔn̩t ænd fɔːɹ bˈoʊθ wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd θˈɜːɾi ˈeɪt pˈæʔn̩ts wɜː sˈɔːt baɪ ðə tɹˈʌstiːz əvə kˈʌmpəni pɹˈiːviəsli fˈɔːɹmd baɪ klˈæɹɪdʒ.