US3768589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker
Assignee: Individual
•
Filing: 1972-04-03
•
Granted: 1973-10-30
•
Expires: 1992-04-03
Abstract
Abstract Loudspeaker with a cabinet in the form of a bent tube having a loudspeaker element at one end and a closure plate at the other end, whereby sound reproduction will be of very high quality although the tube is relatively small in size compared with conventional loudspeaker cabinets.
Inventors
- 👤 L Nilsson
- 👤 B Tyke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:43
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2869; H04R1/2876; H04R1/288; H04R1/24; H04R3/00; H04R3/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
98 words
A loudspeaker system comprising a cabinet in the form of a rigid tube bent at an angle so as to form a first tube section and a second tube section, the cross-section of said tube being in the form of a closed curve, the end of said tube at said first tube section being closed by a plate means including a soft, dense metal and a loudspeaker means being positioned at the end of said second tube section at the other end of said tube; and damping means covering substantially all of the inner walls of said cabinet.
Claim 2
Dependent Claim
98 words
A loudspeaker system comprising a cabinet in the form of a rigid tube bent at an angle so as to form a first tube section and a second tube section, the cross-section of said tube being in the form of a closed curve, the end of said tube at said first tube section being closed by a plate means including a soft, dense metal and a loudspeaker means being positioned at the end of said second tube section at the other end of said tube; and damping means covering substantially all of the inner walls of said cabinet.
Claim 3
Dependent Claim
27 words
A loudspeaker system as claimed in claim 1 wherein said tube is bent at substantially right angles so as to form said first and second tube sections.
Claim 4
Dependent Claim
26 words
A loudspeaker system as claimed in claim 1 wherein the length of said second tube section is greater than the length of said first tube section.
Claim 5
Dependent Claim
23 words
A loudspeaker system as claimed in claim 1 wherein the ratio of the lengths of said first and second tube sections is 1:2.
Claim 6
Dependent Claim
13 words
A loudspeaker system as claimed in claim 1 wherein said tube is cylindrical.
Claim 7
Dependent Claim
30 words
A loudspEaker system as claimed in claim 1 wherein said loudspeaker means comprises two loudspeaker elements and said system further includes a dividing filter connecting said two loudspeaker elements together.
Claim 8
Dependent Claim
68 words
A loudspeaker system as claimed in claim 6 wherein one of said two loudspeaker elements is of the bass type and the other of said two loudspeaker elements is of the treble type; said bass type loudspeaker element being positioned centrally at the end of said second tube section and said treble type loudspeaker element being positioned in front of and coaxially with said bass type loudspeaker element.
Claim 9
Dependent Claim
26 words
A loudspeaker system as claimed in claim 7 wherein the length of said second tube section is greater than the length of said first tube section.
Claim 10
Dependent Claim
23 words
A loudspeaker system as claimed in claim 7 wherein the ratio of the lengths of said first and second tube sections is 1:2.
Claim 11
Dependent Claim
13 words
A loudspeaker system as claimed in claim 7 wherein said tube is cylindrical.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |