Patent US3280258A successfully refreshed from Google Patents.
US3280258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuits for sound reproduction
Assignee: Individual
•
Filing: 1963-06-28
•
Granted: 1966-10-18
•
Expires: 1983-06-28
Abstract
No abstract record available.
Inventors
- 👤 Gale B Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:29
CPC Classifications
H; H04; H04S; H04S3/00; Y; Y10; Y10S; Y10S84/00; Y10S84/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A STEREOPHONIC SOUND SYSTEM, THE COMBINATION COMPRISING: A SOURCE OF TWO STEREOPHONIC AUDIO SIGNALS; FIRST AND SECOND SPEAKERS; INTERMEDIATE SPEAKER MEANS; MEANS TO INTRODUCE THE SAME FRACTION OF EACH OF SAID AUDIO SIGNALS TO SAID INTERMEDIATE SPEAKER MEANS; MEANS TO INTRODUCE ONE OF SAID AUDIO SIGNALS TO SAID FIRST SPEAKER LESS A SECOND FRACTION OF THE INPUT TO SAID INTERMEDIATE SPEAKER MEANS; AND MEANS TO INTRODUCE THE OTHER OF SAID AUDIO SIGNALS TO SAID SECOND SPEAKER LESS SAID SECOND FRACTION OF THE INPUT TO SAID INTERMEDIATE SPEAKER MEANS.
Claim 2
Dependent Claim
89 words
IN A STEREOPHONIC SOUND SYSTEM, THE COMBINATION COMPRISING: A SOURCE OF TWO STEREOPHONIC AUDIO SIGNALS; FIRST AND SECOND SPEAKERS; INTERMEDIATE SPEAKER MEANS; MEANS TO INTRODUCE THE SAME FRACTION OF EACH OF SAID AUDIO SIGNALS TO SAID INTERMEDIATE SPEAKER MEANS; MEANS TO INTRODUCE ONE OF SAID AUDIO SIGNALS TO SAID FIRST SPEAKER LESS A SECOND FRACTION OF THE INPUT TO SAID INTERMEDIATE SPEAKER MEANS; AND MEANS TO INTRODUCE THE OTHER OF SAID AUDIO SIGNALS TO SAID SECOND SPEAKER LESS SAID SECOND FRACTION OF THE INPUT TO SAID INTERMEDIATE SPEAKER MEANS.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |