US3286248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording level intensity indicator
Assignee: 3M Co
•
Filing: 1962-10-25
•
Granted: 1966-11-15
•
Expires: 1982-10-25
Abstract
No abstract record available.
Inventors
- 👤 Ronald W Koss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:17
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/165; G01R19/16566; G01R19/16576; G01R19/1658; H; H03; H03J; H03J1/00; H03J1/02; H03J1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN APPARATUS FOR RECORDING OUTPUT SIGNALS FROM A TRANSISTORIZED AUDIO AMPLIFIER ON RECORDING MEDIA INCLUDING A DEVICE FOR INDICATING THE VOLUME LEVEL, SAID DEVICE COMPRISING A CIRCUIT INCLUDING AN INCANDESCENT LAMP SAID MEANS PROVIDING A PREDETERMINED RESISTANCE IN SAID CIRCUIT, SAID LAMP AND SAID PREDETERMINED RESISTANCE MEANS BEING CONNECTED ACROSS SAID AMPLIFIER OUTPUT TO HAVE THE OUTPUT SIGNALS IMPRESSED DIRECTLY THEREON CAUSING SAID OUTPUT SIGNALS TO DIRECTLY ENERGIZE SAID LAMP, SAID PREDETERMINED RESISTANCE MEANS CAUSING SAID LAMP TO HAVE A DULL RED GLOW WHEN THE AMPLIFIER OUTPUT SIGNALS ARE AT A DESIRED RECORDING LEVEL AND AFFORDING A VISIBLE CHANGE IN ILLUMINATION IN SAID LAMP FROM SAID DULL RED GLOW TO A BRIGHT GLOW WHEN THE R.M.S. OF THE OUTPUT SIGNALS APPROACH THE DISTORTION LEVEL.
Claim 2
Dependent Claim
124 words
IN APPARATUS FOR RECORDING OUTPUT SIGNALS FROM A TRANSISTORIZED AUDIO AMPLIFIER ON RECORDING MEDIA INCLUDING A DEVICE FOR INDICATING THE VOLUME LEVEL, SAID DEVICE COMPRISING A CIRCUIT INCLUDING AN INCANDESCENT LAMP SAID MEANS PROVIDING A PREDETERMINED RESISTANCE IN SAID CIRCUIT, SAID LAMP AND SAID PREDETERMINED RESISTANCE MEANS BEING CONNECTED ACROSS SAID AMPLIFIER OUTPUT TO HAVE THE OUTPUT SIGNALS IMPRESSED DIRECTLY THEREON CAUSING SAID OUTPUT SIGNALS TO DIRECTLY ENERGIZE SAID LAMP, SAID PREDETERMINED RESISTANCE MEANS CAUSING SAID LAMP TO HAVE A DULL RED GLOW WHEN THE AMPLIFIER OUTPUT SIGNALS ARE AT A DESIRED RECORDING LEVEL AND AFFORDING A VISIBLE CHANGE IN ILLUMINATION IN SAID LAMP FROM SAID DULL RED GLOW TO A BRIGHT GLOW WHEN THE R.M.S. OF THE OUTPUT SIGNALS APPROACH THE DISTORTION LEVEL.
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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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |