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 |
| 4674116 | Telephone line concentrator without switching matrix Apparatus for use in conjunction with a PBX system and a telephone answering system is disclosed in which line scanners are used to detect the presence of ring signals on each of the extension lines within the PBX system and to determine when the number o... | 06/16/1987 |
| 4672660 | Method and system for identifying telephone callers An apparatus is disclosed for identifying who is placing a call to a telephone prior to answering. The apparatus, which is preferably located at the telephone central office, includes a switching matrix having a plurality of DID access lines coupling the ... | 06/09/1987 |
| 4629831 | Series connected interceptor The series connected interceptor is a control system for assisting in providing improved service operations for a PBX system. This control system is connected in series in a DID trunk between a TELCO central office and a PBX. By the nature of where it is ... | 12/16/1986 |
