Patent US5929771A successfully refreshed from Google Patents.
US5929771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable wireless communication device
Assignee: Seiko Instruments Inc
•
Filing: 1995-07-26
•
Granted: 1999-07-27
•
Expires: 2015-07-26
Abstract
Abstract A portable communication device which also has an infrared transceiver. A portable communication device can automatically establish infrared communication sessions with another portable communication device or desktop computer having an infrared transceiver. The portable communication device and the other device may exchange textual and graphical information, as well as the current time, and then reconcile the newly received information with that information in possession before the communication session began. Multiple portable communication devices and computers may communicate, while conserving battery power, using a time division multiplexing scheme where the infrared transceivers are active during a short, periodic time slots. Multiple communication session may overlap in time as long as they are not active during the same time slot.
Inventors
- 👤 Garold B. Gaskill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:24
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/114; G; G08; G08B; G08B5/00; G08B5/22; G08B5/222; G08B5/223; G08B5/224; G08B5/228; H04B10/1143
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A system comprising in combination: a terminal which broadcast hailing messages, said hailing messages being broadcast repeatedly at a first periodic rate utilizing electromagnetic radiation having a wave length shorter than radio waves, and a receiver comprising a periodically operative, wrist mounted, battery operated device, said receiver having a wristwatch form factor and an identification number, said receiver having means for receiving said hailing messages and means for transmitting to said terminal said identification number in response to the receipt of a hailing message, said means for transmitting utilizing electromagnetic energy having a wave length shorter than radio waves for said transmission, said terminal including means for storing messages addressed to said receiver, and means for transmitting said messages to said receiver in response to the receipt of said identification number.
Claim 2
Independent Claim
131 words
A system comprising in combination: a terminal which broadcast hailing messages, said hailing messages being broadcast repeatedly at a first periodic rate utilizing electromagnetic radiation having a wave length shorter than radio waves, and a receiver comprising a periodically operative, wrist mounted, battery operated device, said receiver having a wristwatch form factor and an identification number, said receiver having means for receiving said hailing messages and means for transmitting to said terminal said identification number in response to the receipt of a hailing message, said means for transmitting utilizing electromagnetic energy having a wave length shorter than radio waves for said transmission, said terminal including means for storing messages addressed to said receiver, and means for transmitting said messages to said receiver in response to the receipt of said identification number.
Claim 3
Independent Claim
111 words
A system including in combination: a computer having stored therein messages, each of said messages addressed to a particular identification number, said computer including first means for periodically transmitting hailing messages utilizing electromagnetic energy having a wave length shorter than radio waves, said hailing messages being transmitted at a first periodic rate, a wristwatch having a first identification number, first receiving means in said wristwatch for receiving said hailing messages transmitting means in said wristwatch for transmitting to said first means said first identification number, second receiving means in said computer for receiving said identification number and for transmitting to said first receiving means messages addressed to said first identification number.
Claim 4
Independent Claim
111 words
A system including in combination: a computer having stored therein messages, each of said messages addressed to a particular identification number, said computer including first means for periodically transmitting hailing messages utilizing electromagnetic energy having a wave length shorter than radio waves, said hailing messages being transmitted at a first periodic rate, a wristwatch having a first identification number, first receiving means in said wristwatch for receiving said hailing messages transmitting means in said wristwatch for transmitting to said first means said first identification number, second receiving means in said computer for receiving said identification number and for transmitting to said first receiving means messages addressed to said first identification number.
References Cited (Backward Citations)
US4506386A
Cited
US4736461A
Cited
US5150954A
Cited
US4897835A
Cited
US4804954A
Cited
US5239294A
Cited
US5155479A
Cited
US5054051A
Cited
US5166973A
Cited
US5166932A
Cited
US5276680A
Cited
US5266942A
Cited
US5241542A
Cited
US5307349A
Cited
US5239521A
Cited
US5440559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-26 | 2003-01-25 | 2003-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-26 | 2007-01-25 | 2007-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-26 | 2011-01-25 | 2011-07-27 | $7700.00 | Window Closed / Lapsed |