Patent US3164221A successfully refreshed from Google Patents.
US3164221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low frequency loudspeaker system
Assignee: Individual
•
Filing: 1961-06-06
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Granted: 1965-01-05
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Expires: 1981-06-06
Abstract
No abstract record available.
Inventors
- 👤 Stanley R Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:36
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10; H04R1/00; H04R1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
LOUDSPEAKER SYSTEM COMPRISING A DIAPHRAGM, A MASS OF GAS, MEANS INCLUDING SAID DIAPHRAGM SUBSTANTIALLY TOTALLY ENCLOSING SAID MASS OF GAS, AND MEANS TO APPLY TO SAID MASS OF GAS ELECTRIC WAVE VIBRATIONS IN A PRESCRIBED FREQUENCY BAND, SAID DIAPHRAGM BEING SUBSTANTIALLY RIGID AND APERIODIC AT ALL FREQUENCIES THROUGHOUT SAID BAND, THE ACOUSTICAL PATH LENGTH FROM ANY POINT IN SAID VIBRATIONS APPLYING MEANS TO THE NEAREST POINT IN SAID DIAPHRAGM BEING APPROXIMATELY ONE-TWENTIETH THE WAVE LENGTH OF SOUND IN SAID GAS AT THE HIGHEST FREQUENCY IN SAID BAND, WHEREBY SAID GAS IS SUBSTANTIALLY A NONCOMPRESSIBLE FLUID WITH RESPECT TO SAID VIBRATIONS.
Claim 2
Dependent Claim
100 words
LOUDSPEAKER SYSTEM COMPRISING A DIAPHRAGM, A MASS OF GAS, MEANS INCLUDING SAID DIAPHRAGM SUBSTANTIALLY TOTALLY ENCLOSING SAID MASS OF GAS, AND MEANS TO APPLY TO SAID MASS OF GAS ELECTRIC WAVE VIBRATIONS IN A PRESCRIBED FREQUENCY BAND, SAID DIAPHRAGM BEING SUBSTANTIALLY RIGID AND APERIODIC AT ALL FREQUENCIES THROUGHOUT SAID BAND, THE ACOUSTICAL PATH LENGTH FROM ANY POINT IN SAID VIBRATIONS APPLYING MEANS TO THE NEAREST POINT IN SAID DIAPHRAGM BEING APPROXIMATELY ONE-TWENTIETH THE WAVE LENGTH OF SOUND IN SAID GAS AT THE HIGHEST FREQUENCY IN SAID BAND, WHEREBY SAID GAS IS SUBSTANTIALLY A NONCOMPRESSIBLE FLUID WITH RESPECT TO SAID VIBRATIONS.
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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) | 1968-01-05 | 1968-07-06 | 1969-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-05 | 1972-07-06 | 1973-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-05 | 1976-07-06 | 1977-01-05 | $7700.00 | Window Closed / Lapsed |