Patent US3175303A successfully refreshed from Google Patents.
US3175303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational teaching and grading machine
Assignee: Individual
•
Filing: 1962-10-01
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Granted: 1965-03-30
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Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Kirkconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
G; G09; G09B; G09B3/00; G09B3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A MACHINE COMPRISING: A CASE, AN INFORMATION STORAGE MEMBER MOVABLY SUPPORTED BY SAID CASE, FIRST AND SECOND ILLUMINATING MEANS FOR DIRECTING LIGHT TO SAID STORAGE MEMBER, EACH ILLUMINATING MEANS INCLUDING AN ELECTRIC LAMP, SAID SECOND ILLUMINATING MEANS INCLUDING A FILTERED LAMP FOR DIRECTING FILTERED LIGHT TO SAID STORAGE MEMBER, ONE LAMP BEING NORMALLY ENERGIZED AND THE OTHER LAMP BEING NORMALLY DE-ENERGIZED
Claim 2
Dependent Claim
61 words
A MACHINE COMPRISING: A CASE, AN INFORMATION STORAGE MEMBER MOVABLY SUPPORTED BY SAID CASE, FIRST AND SECOND ILLUMINATING MEANS FOR DIRECTING LIGHT TO SAID STORAGE MEMBER, EACH ILLUMINATING MEANS INCLUDING AN ELECTRIC LAMP, SAID SECOND ILLUMINATING MEANS INCLUDING A FILTERED LAMP FOR DIRECTING FILTERED LIGHT TO SAID STORAGE MEMBER, ONE LAMP BEING NORMALLY ENERGIZED AND THE OTHER LAMP BEING NORMALLY DE-ENERGIZED
References Cited (Backward Citations)
US2311055A
Cited
US1422527A
Cited
US2092577A
Cited
US2564089A
Cited
US2663091A
Cited
US2720038A
Cited
US3081088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |