Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4412101 | Call data monitoring for electromechanical telephone switching systems In order to provide call data monitoring for an Automatic Electric step-by-step switching system, the identification of the line number of a calling subscriber line in a group of subscriber lines is accomplished by identifying which of the line finders fo... | 10/25/1983 |
| 3947643 | Method of providing dialtone first on step by step telephone systems A step by step central office serving coin box subsets is provided with a link circuit which on initiation of a call from the coin box sub-set connects the line finder circuit through an auxiliary coin trunk circuit to the central office equipment. This i... | 03/30/1976 |
