Patent US3135349A successfully refreshed from Google Patents.
US3135349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker
Assignee: Individual
•
Filing: 1962-04-02
•
Granted: 1964-06-02
•
Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Uolevi L Lahti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:53
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/36; H04R1/22; H04R1/28; H04R1/2869; H04R1/2876; H04R1/288; H04R1/2892; H04R1/2896
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A LOUDSPEAKER SYSTEM, COMPRISING A LOUDSPEAKER HAVING A DIAPHRAGM HAVING A CONCAVE SIDE, A SPIDER SUPPORTING SAID DIAPHRAGM AND A MOTOR FOR DRIVING SAID DIAPHRAGM, AN ENCLOSURE HAVING A FRONT WALL, A REAR WALL, TOP AND BOTTOM WALLS AND SIDE WALLS, SAID REAR WALL, TOP AND BOTTOM WALLS AND SIDE WALLS BEING ACOUSTICALLY IMPERFORATE, A PASSAGE IN SAID FRONT WALL EXTENDING FROM APPROXIMATELY THE FORWARD SURFACE OF SAID FRONT WALL TO THE REARWARD SURFACE OF SAID FRONT WALL, SAID PASSAGE BEING EXPONENTIAL HORN SHAPED AND HAVING ITS SMALLER OPENING IN SAID FORWARD SURFACE AND ITS LARGER OPENING IN SAID REARWARD SURFACE, SAID LARGER OPENING CONFORMING IN SHAPE AND SIZE TO THE SHAPE AND SIZE OF SAID DIAPHRAGM AND FACING AND ACOUSTICALLY COUPLED TO THE CONCAVE SIDE OF SAID DIAPHRAGM AND SAID SMALLER OPENING HAVING LESS THAN ONE HALF THE AREA OF SAID LARGER OPENING.
Claim 2
Dependent Claim
144 words
A LOUDSPEAKER SYSTEM, COMPRISING A LOUDSPEAKER HAVING A DIAPHRAGM HAVING A CONCAVE SIDE, A SPIDER SUPPORTING SAID DIAPHRAGM AND A MOTOR FOR DRIVING SAID DIAPHRAGM, AN ENCLOSURE HAVING A FRONT WALL, A REAR WALL, TOP AND BOTTOM WALLS AND SIDE WALLS, SAID REAR WALL, TOP AND BOTTOM WALLS AND SIDE WALLS BEING ACOUSTICALLY IMPERFORATE, A PASSAGE IN SAID FRONT WALL EXTENDING FROM APPROXIMATELY THE FORWARD SURFACE OF SAID FRONT WALL TO THE REARWARD SURFACE OF SAID FRONT WALL, SAID PASSAGE BEING EXPONENTIAL HORN SHAPED AND HAVING ITS SMALLER OPENING IN SAID FORWARD SURFACE AND ITS LARGER OPENING IN SAID REARWARD SURFACE, SAID LARGER OPENING CONFORMING IN SHAPE AND SIZE TO THE SHAPE AND SIZE OF SAID DIAPHRAGM AND FACING AND ACOUSTICALLY COUPLED TO THE CONCAVE SIDE OF SAID DIAPHRAGM AND SAID SMALLER OPENING HAVING LESS THAN ONE HALF THE AREA OF SAID LARGER OPENING.
References Cited (Backward Citations)
US1755636A
Cited
US1781605A
Cited
US2775309A
Cited
US2900040A
Cited
US2979150A
Cited
US3067834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |