Patent US2308332A successfully refreshed from Google Patents.
US2308332A
Expired / Lapsed
US
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Heating system for dry kilns
Assignee: IRWIN EQUIPMENT Co
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Filing: 1940-12-02
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Granted: 1943-01-12
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Expires: 1960-12-02
Abstract
No abstract record available.
Inventors
- 👤 Robert W Irwin
- 👤 Cornelius M Herz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:21
CPC Classifications
F; F26; F26B; F26B21/00; F26B21/20; F26B21/25; F26B21/30; F26B21/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-01-11 | 1946-07-13 | 1947-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-01-11 | 1950-07-13 | 1951-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-01-11 | 1954-07-13 | 1955-01-12 | $7700.00 | Window Closed / Lapsed |