USB472284I5 - - Google Patents
Info
- Publication number
- USB472284I5 USB472284I5 US47228474A USB472284I5 US B472284 I5 USB472284 I5 US B472284I5 US 47228474 A US47228474 A US 47228474A US B472284 I5 USB472284 I5 US B472284I5
- Authority
- US
- United States
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7307296A NL7307296A (fr) | 1973-05-25 | 1973-05-25 | |
| NL7307296 | 1973-05-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| USB472284I5 true USB472284I5 (fr) | 1976-01-13 |
| US3982078A US3982078A (en) | 1976-09-21 |
Family
ID=19818945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US05/472,284 Expired - Lifetime US3982078A (en) | 1973-05-25 | 1974-05-22 | Line matching circuit for use in a tone pushbutton dialling subscriber's set provided with a tone generator |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3982078A (fr) |
| JP (1) | JPS5022507A (fr) |
| BE (1) | BE815522A (fr) |
| CA (1) | CA997079A (fr) |
| DE (1) | DE2424335A1 (fr) |
| DK (1) | DK280374A (fr) |
| ES (1) | ES426575A1 (fr) |
| FR (1) | FR2231167A1 (fr) |
| GB (1) | GB1438263A (fr) |
| IT (1) | IT1012756B (fr) |
| NL (1) | NL7307296A (fr) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU518350B2 (en) * | 1978-11-08 | 1981-09-24 | International Standard Electric Corp. | Bidirectional amplifier |
| JPS5973510A (ja) * | 1982-10-19 | 1984-04-25 | Pola Chem Ind Inc | 化粧料 |
| US5172410A (en) * | 1990-04-26 | 1992-12-15 | Sound Control Technologies, Inc. | Conference telephone system and method |
| JPH0561237A (ja) * | 1991-05-30 | 1993-03-12 | Fuji Xerox Co Ltd | マイクロカプセルおよびその製造方法 |
| JPH05142847A (ja) * | 1991-11-15 | 1993-06-11 | Fuji Xerox Co Ltd | マイクロカプセルおよびマイクロカプセルトナー並びにそ の製造法 |
| JP2800558B2 (ja) * | 1992-04-22 | 1998-09-21 | 富士ゼロックス株式会社 | 静電荷像現像用マイクロカプセルトナーおよびマイクロカプセルの形成法 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3731004A (en) * | 1971-05-28 | 1973-05-01 | Microsystems Int Ltd | Impedance matching circuit for tone ringing |
| US3823272A (en) * | 1971-12-09 | 1974-07-09 | Int Standard Electric Corp | Electronic telephone transmission circuit |
-
1973
- 1973-05-25 NL NL7307296A patent/NL7307296A/xx unknown
-
1974
- 1974-05-18 DE DE2424335A patent/DE2424335A1/de active Pending
- 1974-05-22 CA CA200,517A patent/CA997079A/en not_active Expired
- 1974-05-22 FR FR7417844A patent/FR2231167A1/fr not_active Withdrawn
- 1974-05-22 ES ES426575A patent/ES426575A1/es not_active Expired
- 1974-05-22 DK DK280374A patent/DK280374A/da unknown
- 1974-05-22 US US05/472,284 patent/US3982078A/en not_active Expired - Lifetime
- 1974-05-22 IT IT23105/74A patent/IT1012756B/it active
- 1974-05-22 GB GB2278674A patent/GB1438263A/en not_active Expired
- 1974-05-24 BE BE144739A patent/BE815522A/fr unknown
- 1974-05-25 JP JP49059246A patent/JPS5022507A/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3731004A (en) * | 1971-05-28 | 1973-05-01 | Microsystems Int Ltd | Impedance matching circuit for tone ringing |
| US3823272A (en) * | 1971-12-09 | 1974-07-09 | Int Standard Electric Corp | Electronic telephone transmission circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5022507A (fr) | 1975-03-11 |
| US3982078A (en) | 1976-09-21 |
| CA997079A (en) | 1976-09-14 |
| IT1012756B (it) | 1977-03-10 |
| FR2231167A1 (fr) | 1974-12-20 |
| NL7307296A (fr) | 1974-11-27 |
| GB1438263A (en) | 1976-06-03 |
| ES426575A1 (es) | 1976-09-01 |
| BE815522A (fr) | 1974-11-25 |
| DK280374A (fr) | 1975-01-20 |
| DE2424335A1 (de) | 1974-12-19 |