US2790401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sectional dumping grate
Assignee: Calcinator Corp
•
Filing: 1953-05-29
•
Granted: 1957-04-30
•
Expires: 1973-05-29
Abstract
No abstract record available.
Inventors
- 👤 John W Hebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:19
CPC Classifications
F; F23; F23H; F23H13/00; F23H13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US37204A
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US65392A
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US153655A
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US249129A
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US677037A
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US1737638A
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US1787081A
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US1769879A
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US1762579A
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FR707962A
Cited
GB669133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |