US4096357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toll-call restriction system
Assignee: Individual
•
Filing: 1976-11-18
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Granted: 1978-06-20
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Expires: 1996-11-18
Abstract
Abstract Apparatus for enabling a user to selectively defeat the toll-call restriction system. The apparatus is comprised of means for applying a tone to the telephone lines through the calling telephone mouthpiece. Detection means responsive to the tone sets a flip flop which functions to inhibit the activation of a relay normally used to disrupt the connection between the calling phone and telephone lines when an unpermitted telephone number is dialed.
Inventors
- 👤 Charles S. Mogtader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:39
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/66; H04M1/677
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
In a toll-call restriction system useful with a telephone unit and a pair of telephone lines for restricting the telephone exchanges which can be reached from said telephone unit, said system including normally closed switch means connecting said telephone unit to said telephone lines and interrupt means for opening said switch means to interrupt said connecton, the improvement comprising: manually actuatable means for generating a sound wave having predetermined characteristics; detector means connected to said telephone lines for sensing the generation of said sound wave; and means responsive to said detector means sensing the generation of said sound wave for disabling said interrupt means.
Claim 2
Dependent Claim
104 words
In a toll-call restriction system useful with a telephone unit and a pair of telephone lines for restricting the telephone exchanges which can be reached from said telephone unit, said system including normally closed switch means connecting said telephone unit to said telephone lines and interrupt means for opening said switch means to interrupt said connecton, the improvement comprising: manually actuatable means for generating a sound wave having predetermined characteristics; detector means connected to said telephone lines for sensing the generation of said sound wave; and means responsive to said detector means sensing the generation of said sound wave for disabling said interrupt means.
Claim 3
Dependent Claim
66 words
The system of claim 1 including a memory storing a plurality of information items identifying those telephone exchanges which said telephone unit is permitted to reach; means for producing a mismatch signal in response to said telephone unit identifying a telephone exchange not identified by information stored in said memory; said interrupt means including gate means responsive to said mismatch signal for opening said switch means.
Claim 4
Dependent Claim
48 words
The system of claim 2 wherein said means responsive to said detector means includes a bistable means for assuming a first state in response to said detector means sensing said sound wave; and means responsive to said bistable means defining said first state for disabling said gate means.
Claim 5
Dependent Claim
16 words
The system of claim 3 including means for resetting said bistable means to a second state.
References Cited (Backward Citations)
US3920936A
Cited
US3953680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |