US2787332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaker system
Assignee: Individual
•
Filing: 1952-09-06
•
Granted: 1957-04-02
•
Expires: 1972-09-06
Abstract
No abstract record available.
Inventors
- 👤 Norman C Fulmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2853; H04R1/2857
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1643284A
Cited
GB342369A
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US2020166A
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FR796407A
Cited
US2224919A
Cited
US2310243A
Cited
US2337213A
Cited
US2373692A
Cited
US2646851A
Cited
GB656732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |