US2439495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heartbeat rate indicating apparatus
Assignee: Burdick Corp
•
Filing: 1942-07-14
•
Granted: 1948-04-13
•
Expires: 1962-07-14
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Sturm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:04
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1816465A
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US1844243A
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US2078792A
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US2114578A
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US2137846A
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US2193945A
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US2110438A
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US2137859A
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US2245717A
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US2273532A
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US2294065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |