Patent US5346508A successfully refreshed from Google Patents.
US3198952A
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Photosensitive obstacle and curb detection device for the blind
Assignee: CORP OF HAVERFORD COLLEGE
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Filing: 1961-09-15
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Granted: 1965-08-03
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Expires: 1981-09-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Benham
- 👤 Jr Joel Malvern Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/46; G01S17/48; G01S17/04; G09; G09B; G09B21/00; G09B21/001; G09B21/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A DEVICE FOR USE BY THE BLIND EMPLOYING ENERGY IN THE VISIBLE OR NEAR VISIBLE LIGHT FREQUENCY RANGES AND EMPLOYING A TRAINGULATION SYSTEM COMPRISING A LIGHT SOURCE, A FIRST MEANS FOR FOCUSING LIGHT FROM THAT SOURCE INTO A BEAM THAT IS CAPABLE OF PRODUCING A SMALL SPOT OF LIGHT ON A SURFACE AT SOME DISTANCE, A SECOND MEANS FOR FOCUSING LIGHT REFLECTED FROM SAID SPOT ONTO DETECTOR MEANS, MEANS TO PULSE THE LIGHT, GATE MEANS SYNCHRONIZED WITH THE PULSE MEANS TO GATE SIGNAL FROM THE DETECTOR MEANS TO PERMIT PASSAGE OF ANY SIGNAL ONLY WHEN PULSES OF LIGHT ARE BEING EMITTED AND TO DISCRIMINATE AGAINST ALL
Claim 2
Independent Claim
106 words
A DEVICE FOR USE BY THE BLIND EMPLOYING ENERGY IN THE VISIBLE OR NEAR VISIBLE LIGHT FREQUENCY RANGES AND EMPLOYING A TRAINGULATION SYSTEM COMPRISING A LIGHT SOURCE, A FIRST MEANS FOR FOCUSING LIGHT FROM THAT SOURCE INTO A BEAM THAT IS CAPABLE OF PRODUCING A SMALL SPOT OF LIGHT ON A SURFACE AT SOME DISTANCE, A SECOND MEANS FOR FOCUSING LIGHT REFLECTED FROM SAID SPOT ONTO DETECTOR MEANS, MEANS TO PULSE THE LIGHT, GATE MEANS SYNCHRONIZED WITH THE PULSE MEANS TO GATE SIGNAL FROM THE DETECTOR MEANS TO PERMIT PASSAGE OF ANY SIGNAL ONLY WHEN PULSES OF LIGHT ARE BEING EMITTED AND TO DISCRIMINATE AGAINST ALL
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |