Patent US2459239A successfully refreshed from Google Patents.
Patent US3159787A successfully refreshed from Google Patents.
US3159787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
R. m. s. meter using amplifier with controlled feedback
Assignee: ELECTRO INSTRUMENTS Inc
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Filing: 1960-03-21
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Granted: 1964-12-01
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Expires: 1980-03-21
Abstract
No abstract record available.
Inventors
- 👤 Don W Sexton
- 👤 Newton E Ball
- 👤 Jack T Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:31
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
AN R.M.S. INSTRUMENT, COMPRISING: AMPLIFIER MEANS HAVING AN INPUT AND AN OUTPUT; A VARIABLE FEEDBACK NETWORK CONNECTED BETWEEN THE INPUT AND OUTPUT OF SAID AMPLIFIER MEANS FOR CONTROLLING THE GAIN AND OUTPUT OF SAID AMPLIFIER MEANS BY VARIATION OF THE FEEDBACK FACTOR; A SQUARING NETWORK FOR SQUARING THE OUTPUT OF SAID AMPLIFIER MEANS; AN R.M.S. STANDARD OF CONSTANT MAGNITUDE; INTEGRATION MEANS FOR COMPARING THE SQUARED OUTPUT OF SAID SQUARING NETWORK WITH SAID R.M.S. STANDARD AND GENERATING ERROR SIGNALS CORRESPONDING TO ANY DIFFERENCE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |