Patent US4868848A successfully refreshed from Google Patents.
US4868848A
Expired / Lapsed
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Computer operated system for dialing telephone numbers
Assignee: Verizon Patent and Licensing Inc
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Filing: 1987-12-21
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Granted: 1989-09-19
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Expires: 2007-12-21
Abstract
Abstract A computer operated telephone dialing system has a program that selects a telephone number from a directory of names and corresponding telephone numbers. The program sends an off-hook instruction and a select flag to the computer's printer port, followed by a hexidecimal code sequence representing digits of the telephone number. A dialing circuit coupled to said printer port is activated by the select flag and, in response to the hexidecimal code sequence, provides DTMF dialing signals to telephone lines. The program then sends an on-hook signal, allowing a telephone handset to be used.
Inventors
- 👤 Joseph W. Magnusson
- 👤 Dennis W. Dufford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:14
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A telephone dialing system comprising: a. a computer having a printer port; b. a data base, accessible by said computer containing a directory of names and corresponding telephone numbers; c. program means for selecting a name and corresponding number from said directory; for sending an off-hook instruction and a select flag to said printer port, for sending to said printer port a hexidecimal code sequence representing digits of the corresponding number and for sending an on-hook instruction to said printer port; and d. a dialing circuit coupled to said printer port and adapted to be coupled to telephone lines, said dialing circuit activated by said select flag and providing DTMF dialing signals corresponding to said hexidecimal code sequence.
Claim 2
Dependent Claim
118 words
A telephone dialing system comprising: a. a computer having a printer port; b. a data base, accessible by said computer containing a directory of names and corresponding telephone numbers; c. program means for selecting a name and corresponding number from said directory; for sending an off-hook instruction and a select flag to said printer port, for sending to said printer port a hexidecimal code sequence representing digits of the corresponding number and for sending an on-hook instruction to said printer port; and d. a dialing circuit coupled to said printer port and adapted to be coupled to telephone lines, said dialing circuit activated by said select flag and providing DTMF dialing signals corresponding to said hexidecimal code sequence.
Claim 3
Dependent Claim
44 words
The telephone dialing computer system of claim 1 which further includes software means for determining if a corresponding number is long distance, local, or internal, and wherein said program means modifies the number of digits of a corresponding number in accordance with said determination.
Claim 4
Dependent Claim
50 words
The telephone computer system of claim 1 wherein said dialing circuit includes a DTMF generator for generating DTMF dialing signals in response to said hexidecimal sequence, a transformer arranged to couple said DTMF dialing signals to a telephone line, and means for limiting the level of said DTMF dialing signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |