Patent US1533738A successfully refreshed from Google Patents.
Patent US2600288A successfully refreshed from Google Patents.
US2600288A
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Frequency stabilizing apparatus
Assignee: Hartford National Bank and Trust Co
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Filing: 1946-04-10
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Granted: 1952-06-10
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Expires: 1966-04-10
Abstract
No abstract record available.
Inventors
- 👤 Zylstra Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:56
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1616622A
Cited
US2055090A
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GB436056A
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US2162883A
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US2233778A
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US2310797A
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US2280527A
Cited
US2406309A
Cited
US2410076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-10 | 1955-12-10 | 1956-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-10 | 1959-12-10 | 1960-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-10 | 1963-12-10 | 1964-06-10 | $7700.00 | Window Closed / Lapsed |