US2837642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse rate discriminator
Assignee: AT&T Inc
•
Filing: 1953-12-17
•
Granted: 1958-06-03
•
Expires: 1973-12-17
Abstract
No abstract record available.
Inventors
- 👤 Alfred K Schenck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:03
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/16; G08C19/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2359447A
Cited
US2636983A
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US2564014A
Cited
US2529666A
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US2553284A
Cited
US2716217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |