Patent US2580856A successfully refreshed from Google Patents.
US2580856A
Expired / Lapsed
US
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Chemical cap for radiators
Assignee: FRANK HORNKOHL
•
Filing: 1949-06-18
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Granted: 1952-01-01
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Expires: 1969-06-18
Abstract
No abstract record available.
Inventors
- 👤 George T Smith
- 👤 Jr Louis Henry Munding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:34
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/06; F01P2011/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191010394A
Cited
GB191316050A
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GB241361A
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US1680103A
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FR626413A
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US1855990A
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US1994551A
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US2172951A
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US2304453A
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US2471142A
Cited
US2455240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |