US2417830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressional wave signaling device
Assignee: AT&T Inc
•
Filing: 1943-07-02
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Granted: 1947-03-25
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Expires: 1963-07-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:44
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0629; Y; Y10; Y10S; Y10S181/00; Y10S181/40; Y10S181/402
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE297996C
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US1481923A
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US2248870A
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US2009451A
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DE620484C
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US2166162A
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US2212604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-24 | 1950-09-23 | 1951-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-24 | 1954-09-23 | 1955-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-24 | 1958-09-23 | 1959-03-25 | $7700.00 | Window Closed / Lapsed |