US2391924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phone and method of making same
Assignee: Brush Development Co
•
Filing: 1941-07-16
•
Granted: 1946-01-01
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Expires: 1961-07-16
Abstract
No abstract record available.
Inventors
- 👤 Donald E Rutter
- 👤 Harry B Shaper
- 👤 Walter J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:45
CPC Classifications
H; H04; H04R; H04R31/00; H04R31/006; H04R17/00; H04R25/00; H04R25/60; H04R2225/00; H04R2225/57; H04R2460/00; H04R2460/15; H04R25/65; H04R25/652; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-31 | 1949-07-02 | 1950-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-31 | 1953-07-02 | 1954-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-31 | 1957-07-02 | 1958-01-01 | $7700.00 | Window Closed / Lapsed |