US4847900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared hookswitch for a telephone
Assignee: Nortel Networks Ltd
•
Filing: 1988-05-02
•
Granted: 1989-07-11
•
Expires: 2008-05-02
Abstract
Abstract An optical hookswitch assembly useable on a telephone set as an optical communications port is disclosed. The hookswitch assembly is comprised of light emitting and detecting diodes so disposed in the telephone so as to detect the presence of a handset. A processor connectable to the telephone circuitry and the light emitting and detecting diodes is provided such that the telephone circuitry is activated by the processor when the light emitting and detecting diodes fail to detect the presence of a handset. The light emitting and detecting diodes are useable as an optical communciations port for accessing the processor by allowing an external computer to communicate with the processor via an optical coupler.
Inventors
- 👤 Michael J. Wakim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:22
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/02; H04M1/21; H04M1/215
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
An optical hookswitch assembly useable on a telephone set as an optical communications port, comprising: light emitting and detecting means so disposed in said telephone so as to detect the presence of a handset; processor means connectable to telephone circuitry means and said light emitting and detecting means, said telephone circuitry means being activated by said processor means when said light emitting and detecting means fails to detect the presence of said handset, said light emitting and detecting means being useable as an optical communications port for accessing said processor means, by allowing an external computer to communicate with said processor means via optical coupler means.
Claim 2
Dependent Claim
106 words
An optical hookswitch assembly useable on a telephone set as an optical communications port, comprising: light emitting and detecting means so disposed in said telephone so as to detect the presence of a handset; processor means connectable to telephone circuitry means and said light emitting and detecting means, said telephone circuitry means being activated by said processor means when said light emitting and detecting means fails to detect the presence of said handset, said light emitting and detecting means being useable as an optical communications port for accessing said processor means, by allowing an external computer to communicate with said processor means via optical coupler means.
Claim 3
Dependent Claim
35 words
An optical hookswitch assembly as defined in claim 1 wherein said processor means comprises message monitoring means, said message monitoring means being initiated when said processor means detects the presence of said optical coupler means.
Claim 4
Dependent Claim
49 words
An optical hookswitch assembly as defined in claim 2 wherein said processor means can communicate with said external computer via said optical coupler means by controlling said light emitting means to emit a light signal at a predetermined baud rate which can be read by said optical coupler means.
Claim 5
Dependent Claim
55 words
An optical hookswitch assembly as defined in claim 3 wherein said external computer can communicate with said processor means via said optical coupler means by controlling said optical coupler means to emit a light signal at said predetermined baud rate which can be read by said light detecting means and transmitted to said processor means.
Claim 6
Dependent Claim
79 words
An optical hookswitch assembly as defined in claim 4 wherein said light emitting and detecting means comprises a light emitting diode and photodetector adapted to be disposed in the handset cradle of said telephone set, said light emitting diode and photodetector being so disposed therein such that when said handset is removed from said cradle, light emitted from said light emitting diode will be detected by said photodetector thereby signalling said processor means to initiate said telephone circuitry means.
Claim 7
Dependent Claim
73 words
An optical hookswitch assembly as defined in claim 5 wherein said optical coupler means comprises an optical coupler having a light emitting diode and a photodetector, said light emitting diode and photodetector being so disposed in said coupler such that when said coupler is placed in said handset cradle, the light emitting diode and photodetector of said coupler will be positioned adjacent the photodetector and light emitting diode, respectively of said handset cradle.
Claim 8
Dependent Claim
17 words
An optical hookswitch assembly as defined in claim 6 wherein said predetermined baud rate is 1200 bits/sec.
Claim 9
Dependent Claim
20 words
An optical hookswitch assembly as defined in claim 7 wherein said light emitting diodes and said photodetectors operate at infrared.
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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |