Patent US2621287A successfully refreshed from Google Patents.
US2621287A
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Noise neutralizing pulse detector
Assignee: Individual
•
Filing: 1948-03-22
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Granted: 1952-12-09
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Expires: 1968-03-22
Abstract
No abstract record available.
Inventors
- 👤 Donald L Hings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1727813A
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US1723440A
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US2099311A
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US2087063A
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US2153969A
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US2179966A
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US2279275A
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US2283404A
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US2363288A
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US2532450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |