US3269023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micrometer level
Assignee: Individual
•
Filing: 1963-07-29
•
Granted: 1966-08-30
•
Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Chauncey L Calkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:04
CPC Classifications
G; G01; G01F; G01F23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A MICROMETER LEVEL INCLUDING A PAIR OF SPACED PLATFORMS, A HOUSING MOUNTED ON EACH OF SAID PLATFORMS, EACH OF SAID HOUSINGS INCLUDING A CHAMBER CONTAINING A COLUMN OF LIQUID MERCURY, EACH HOUSING MOUNTING A NON-METALLIC ELECTRODE POSITIONED FOR CONTACT WITH THE COLUMN OF MERCURY IN THAT HOUSING, AN ELECTRICAL CONNECTION BETWEEN SAID COLUMNS OF MERCURY INCLUDING A FLEXIBLE HOSE CONTAINING A POOL OF LIQUID MERCURY, SAID HOSE HAVING AN ELECTRICALLY CONDUCTIVE REINFORCEMENT WHICH IS ELECTRICALLY INSULATED FROM SAID MERCURY, ONE OF SAID ELECTRODES BEING ELECTRICALLY CONNECTED TO SAID ELECTRICALLY CONDUCTIVE REINFORCEMENT, THE OTHER ELECTRODE BEING CONNECTED THROUGH A HIGH RESISTANCE TO AN INDICATOR, A TRANSISTOR, THE EMITTER AND COLLECTOR OF SAID TRANSISTOR BEING IN SERIES CONNECTION WITH SAID INDICATOR AND A D.C. VOLTAGE SOURCE, THE BODY OF SAID TRANSISTOR BEING CONNECTED TO SAID ELECTRICALLY CON-
Claim 2
Dependent Claim
135 words
A MICROMETER LEVEL INCLUDING A PAIR OF SPACED PLATFORMS, A HOUSING MOUNTED ON EACH OF SAID PLATFORMS, EACH OF SAID HOUSINGS INCLUDING A CHAMBER CONTAINING A COLUMN OF LIQUID MERCURY, EACH HOUSING MOUNTING A NON-METALLIC ELECTRODE POSITIONED FOR CONTACT WITH THE COLUMN OF MERCURY IN THAT HOUSING, AN ELECTRICAL CONNECTION BETWEEN SAID COLUMNS OF MERCURY INCLUDING A FLEXIBLE HOSE CONTAINING A POOL OF LIQUID MERCURY, SAID HOSE HAVING AN ELECTRICALLY CONDUCTIVE REINFORCEMENT WHICH IS ELECTRICALLY INSULATED FROM SAID MERCURY, ONE OF SAID ELECTRODES BEING ELECTRICALLY CONNECTED TO SAID ELECTRICALLY CONDUCTIVE REINFORCEMENT, THE OTHER ELECTRODE BEING CONNECTED THROUGH A HIGH RESISTANCE TO AN INDICATOR, A TRANSISTOR, THE EMITTER AND COLLECTOR OF SAID TRANSISTOR BEING IN SERIES CONNECTION WITH SAID INDICATOR AND A D.C. VOLTAGE SOURCE, THE BODY OF SAID TRANSISTOR BEING CONNECTED TO SAID ELECTRICALLY CON-
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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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |