Patent US3553572A successfully refreshed from Google Patents.
US3553572A
Expired / Lapsed
US
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Portable electric circuit tester having a pair of resistance indicating lamps
Assignee: LUMIDOR PRODUCTS CORP
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Filing: 1968-07-25
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Granted: 1971-01-05
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Expires: 1988-07-25
Abstract
Abstract A PORTABLE ELECTRIC TESTER ENERGIZED BY A PAIR OF SELFCONTAINED BATTERIES INCLUDING SWITCH MEANS AND A PAIR OF ELECTRIC LAMPS FOR DETERMINING FOUR APPROXIMATE RANGES OF EXTERNAL CIRCUIT RESISTANCE DEPENDENT UPON THE VISUAL INTERPRETATION OF THE LUMINOSITY OF EACH OF THE LAMPS.
Inventors
- 👤 James R Harmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:41
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |