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US1814567A
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Recirculating system and apparatus for waste furnace gases
Assignee: Siemens Industry Inc
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Filing: 1929-09-16
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Granted: 1931-07-14
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Expires: 1949-09-16
Abstract
No abstract record available.
Inventors
- 👤 Gustav A Merkt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:07
CPC Classifications
C; C21; C21D; C21D9/00
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) | 1934-07-13 | 1935-01-12 | 1935-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-07-13 | 1939-01-12 | 1939-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-07-13 | 1943-01-12 | 1943-07-14 | $7700.00 | Window Closed / Lapsed |