US3370224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current resistance bridge circuit
Assignee: Robertshaw Controls Co
•
Filing: 1965-10-07
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Granted: 1968-02-20
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Expires: 1985-10-07
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Merrell
- 👤 James H Koegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:07
CPC Classifications
G; G05; G05B; G05B1/00; G05B1/01; G05B1/02; G05B1/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
IN A DIRECT CURRENT RESISTANCE BRIDGE INCLUDING FIRST AND SECOND INPUT TERMINALS AND FIRST AND SECOND PARALLEL CURRENT PATHS BETWEEN SAID FIRST AND SECOND INPUT TERMINALS, ENERGIZING MEANS FOR SAID BRIDGE COMPRISING CONSTANT CURRENT GENERATOR MEANS PROVIDING A CONSTANT REFERENCE CURRENT FLOW IN SAID FIRST AND SECOND PARALLEL CURRENT PATHS.
Claim 2
Dependent Claim
50 words
IN A DIRECT CURRENT RESISTANCE BRIDGE INCLUDING FIRST AND SECOND INPUT TERMINALS AND FIRST AND SECOND PARALLEL CURRENT PATHS BETWEEN SAID FIRST AND SECOND INPUT TERMINALS, ENERGIZING MEANS FOR SAID BRIDGE COMPRISING CONSTANT CURRENT GENERATOR MEANS PROVIDING A CONSTANT REFERENCE CURRENT FLOW IN SAID FIRST AND SECOND PARALLEL CURRENT PATHS.
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) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |