US2623254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker construction
Assignee: Individual
•
Filing: 1948-09-23
•
Granted: 1952-12-30
•
Expires: 1968-09-23
Abstract
No abstract record available.
Inventors
- 👤 John A Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:34
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US974024A
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US1711414A
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US1793854A
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US1989996A
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US2095373A
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US2083395A
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US2223496A
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US2201024A
Cited
US2351904A
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US2367428A
Cited
US2371820A
Cited
US2493414A
Cited
US2467218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |