US2766903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head closure construction for heat exchangers
Assignee: Griscom Russell Co
•
Filing: 1953-02-17
•
Granted: 1956-10-16
•
Expires: 1973-02-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank Boni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:11
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/0202; F28F2220/00; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205; Y10T292/212; Y10T292/214
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1824898A
Cited
US1911608A
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FR678593A
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US2009877A
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US2061641A
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US2316437A
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US2389824A
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US2548934A
Cited
US2647656A
Cited
US2547521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |