US2744584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Public address housing assembly
Assignee: Individual
•
Filing: 1952-06-19
•
Granted: 1956-05-08
•
Expires: 1972-06-19
Abstract
No abstract record available.
Inventors
- 👤 James B Hellon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:47
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/02; H04R1/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1738955A
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US1823512A
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US1843367A
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US1944861A
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US1905215A
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US2165637A
Cited
US2157609A
Cited
US2282384A
Cited
FR908709A
Cited
US2619893A
Cited
US2581251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |