Patent US5335246A successfully refreshed from Google Patents.
US5335246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pager with reverse paging facility
Assignee: Nexus 1994 Ltd
•
Filing: 1992-10-15
•
Granted: 1994-08-02
•
Expires: 2012-10-15
Abstract
Abstract Position determining apparatus including at least one base station including a base transmitter which periodically transmits timing signals and a plurality of mobile remote units. Each remote unit includes a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread-spectrum frequency-hopping sequence characteristic of the particular remote unit; a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and a message generator operative to modify the radiated frequency-hopped signal to transmit a message to the at least one base station. least one base station.
Inventors
- 👤 Hanoch Yokev
- 👤 Haim Harel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
H; H04; H04W; H04W64/00; G; G01; G01S; G01S1/00; G01S1/02; G01S1/022; G01S1/026; G01S3/00; G01S3/02; G01S3/023; G01S3/04; G01S3/043; G01S3/10; G01S5/00; G01S5/0009; G01S5/02; G01S5/0205; G01S5/021; G01S5/04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7156; H04B7/00; H04B7/24; H04B7/26; H04B7/2662; H04B7/2671; H04B7/2678; H04B7/2681; H04B7/2687; H04B7/2693; H04W88/00; H04W88/02; H04W88/022
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
97 words
Paging apparatus comprising: at least one base station including a base transmitter which periodically transmits timing signals; and a plurality of remote units, each including: a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread spectrum frequency-hopping sequence characteristic of the particular remote unit; a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and a message generator operative to modify the radiated frequency-hopped signal to transmit a message to at least one base station.
Claim 2
Dependent Claim
97 words
Paging apparatus comprising: at least one base station including a base transmitter which periodically transmits timing signals; and a plurality of remote units, each including: a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread spectrum frequency-hopping sequence characteristic of the particular remote unit; a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and a message generator operative to modify the radiated frequency-hopped signal to transmit a message to at least one base station.
Claim 3
Dependent Claim
39 words
Apparatus according to claim 1 wherein the base station includes: a base receiver which receives the radiated frequency hopped signal; and signal identification circuitry operative for identifying the remote unit based on the frequency sequence of received frequency-hopped signal.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 2 wherein the base station also includes means for determining direction of the remote unit.
Claim 5
Dependent Claim
26 words
Apparatus according to claim 1 wherein the remote unit includes means for providing an activating signal to activate the mobile transmitter in response to activation signals.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 4 wherein the activation signal is produced by a carrier of the remote unit.
Claim 7
Dependent Claim
21 words
Apparatus according to claim 4 wherein the activation signal is transmitted by the bases station and received by the remote unit.
Claim 8
Dependent Claim
27 words
Apparatus according to claim 1 wherein the remote unit further comprises a frequency synthesizer which produces a frequency responsive to the resonant frequency of a resonant circuit.
Claim 9
Dependent Claim
33 words
Apparatus according to claim 7, wherein the resonant circuit includes a fixed high-Q element and a perturbating element which is periodically switched into the resonant circuit whereby the resonant frequency is periodically switched.
Claim 10
Dependent Claim
13 words
Apparatus according to claim 8 wherein the fixed high-Q element is a crystal.
Claim 11
Dependent Claim
16 words
Apparatus according to claim 9 wherein the perturbating element is a capacitor switched by a diode.
Claim 12
Dependent Claim
62 words
Apparatus according to claim 1 wherein the message generator comprises: a frequency generator which generates a sequence of pulses each having one of two nearby frequencies in response to an input; and an encoder which chooses a particular pulse sequence responsive to an input by a carrier of the remote unit, whereby the particular sequence represents a message chosen by the carrier.
Claim 13
Dependent Claim
30 words
Apparatus according to claim 11 wherein the base station comprises: a decoder which receives and decodes the sequence; and a message dispatcher which dispatches the message to an intended destination.
Claim 14
Dependent Claim
26 words
Apparatus according to claim 11 wherein the remote unit includes means for providing an activating signal to activate the mobile transmitter in response to activation signals.
Claim 15
Dependent Claim
18 words
Apparatus according to claim 13 wherein the activation signal is produced by a carrier of the remote unit.
Claim 16
Dependent Claim
21 words
Apparatus according to claim 13 wherein the activation signal is transmitted by the base station and received by the remote unit.
Claim 17
Dependent Claim
27 words
Apparatus according to claim 11 wherein the remote unit further comprises a frequency synthesizer which produces a frequency responsive to the resonant frequency of a resonant circuit.
Claim 18
Dependent Claim
33 words
Apparatus according to claim 16, wherein the resonant circuit includes a fixed high-Q element and a perturbating element which is periodically switched into the resonant circuit whereby the resonant frequency is periodically switched.
Claim 19
Dependent Claim
13 words
Apparatus according to claim 17 wherein the fixed high-Q element is a crystal.
Claim 20
Dependent Claim
16 words
Apparatus according to claim 18 wherein the perturbating element is a capacitor switched by a diode.
Claim 21
Dependent Claim
76 words
A reverse paging transmission system comprising: a plurality of portable remote units; and a base station operative to transmit a first message to any one of the remote units, wherein the remote unit is operative, when activated by a carrier of the remote unit, to transmit frequency-hopped spread spectrum signals containing second messages to the base station and the base station is operative to transmit the second messages to a destination indicated by the remote unit.
Claim 22
Dependent Claim
76 words
A reverse paging transmission system comprising: a plurality of portable remote units; and a base station operative to transmit a first message to any one of the remote units, wherein the remote unit is operative, when activated by a carrier of the remote unit, to transmit frequency-hopped spread spectrum signals containing second messages to the base station and the base station is operative to transmit the second messages to a destination indicated by the remote unit.
References Cited (Backward Citations)
US3223779A
Cited
US3706933A
Cited
US3384822A
Cited
US3447085A
Cited
US3824468A
Cited
US3493866A
Cited
US4193030A
Cited
US3972042A
Cited
USRE32365E
Cited
US4030033A
Cited
US4188629A
Cited
US4053889A
Cited
US4114155A
Cited
US4079378A
Cited
US4156877A
Cited
US4152702A
Cited
US4222115A
Cited
US4229741A
Cited
US4267592A
Cited
US4309703A
Cited
US4403343A
Cited
US4447907A
Cited
US4494238A
Cited
US4479227A
Cited
US4578819A
Cited
US4665404A
Cited
US4545059A
Cited
US4644351A
Cited
EP0166551A1
Cited
US4866732A
Cited
US5005183A
Cited
US4611333A
Cited
US4694466A
Cited
US4785463A
Cited
US4701934A
Cited
US5063560A
Cited
US4750036A
Cited
US4740792A
Cited
US5099245A
Cited
US4811379A
Cited
US4882579A
Cited
US4823123A
Cited
US4891637A
Cited
US4875038A
Cited
US4825193A
Cited
US4928177A
Cited
US4868560A
Cited
US5153582A
Cited
US5073899A
Cited
US5142279A
Cited
US5017926A
Cited
US5073900A
Cited
US5103459A
Cited
US5103459B1
Cited
WO1992003558A1
Cited
WO1992004796A1
Cited
US5142534A
Cited
EP0484918A2
Cited
US5212831A
Cited
WO1992011722A1
Cited
US5105435A
Cited
US5148452A
Cited
WO1992012601A1
Cited
US5144668A
Cited
US5111478A
Cited
US5193101A
Cited
WO1992017012A1
Cited
WO1992017011A1
Cited
US5204876A
Cited
US5155742A
Cited
US5222101A
Cited
US5164958A
Cited
US5235615A
Cited
US5191593A
Cited
US5239677A
Cited
US5210771A
Cited
US5193102A
Cited
US5193102B1
Cited
US5267261A
Cited
US5226045A
Cited
US5224121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |