Patent US2623254A successfully refreshed from Google Patents.
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
2026-10-31 14:37
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US974024A
Cited
US1711414A
Cited
US1793854A
Cited
US1989996A
Cited
US2095373A
Cited
US2083395A
Cited
US2223496A
Cited
US2201024A
Cited
US2351904A
Cited
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 |