Patent US3302748A successfully refreshed from Google Patents.
US3302748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker system
Assignee: Individual
•
Filing: 1963-04-11
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Granted: 1967-02-07
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Expires: 1983-04-11
Abstract
No abstract record available.
Inventors
- 👤 Prentiss B Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:26
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2803; H04R1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN COMBINATION, A SOUND GENERATOR DIAPHRAGM, ACOUSTICALLY CONDUCTING MEANS CONFINING A DENSE GAS PORTION IN FRONT OF THE DIAPHRAGM, MEANS CONFINING A DENSE GAS PORTION AT THE REAR OF THE DIAPHRAGM, A SMALL COMMUNICATING MEANS OR CAPILLARY JOINING THE FRONT AND REAR PORTIONS OF GAS, AND AN ACCOMMODATOR OR COMPENSATION APPARATUS COMMUNICATING WITH THE PORTIONS OF GAS AND REACTING TO AMBIENT EFFECTS, ACCOMMODATING, AS REQUIRED, AMBIENT EFFECTS ON SAID PORTIONS OF GAS, BY WITHDRAWING OR PROVIDING GAS, AS REQUIRED.
Claim 2
Dependent Claim
79 words
IN COMBINATION, A SOUND GENERATOR DIAPHRAGM, ACOUSTICALLY CONDUCTING MEANS CONFINING A DENSE GAS PORTION IN FRONT OF THE DIAPHRAGM, MEANS CONFINING A DENSE GAS PORTION AT THE REAR OF THE DIAPHRAGM, A SMALL COMMUNICATING MEANS OR CAPILLARY JOINING THE FRONT AND REAR PORTIONS OF GAS, AND AN ACCOMMODATOR OR COMPENSATION APPARATUS COMMUNICATING WITH THE PORTIONS OF GAS AND REACTING TO AMBIENT EFFECTS, ACCOMMODATING, AS REQUIRED, AMBIENT EFFECTS ON SAID PORTIONS OF GAS, BY WITHDRAWING OR PROVIDING GAS, AS REQUIRED.
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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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |