US2831467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cooling and utilizing the heat of waste gases
Assignee: Waagner Biro AG
•
Filing: 1953-09-04
•
Granted: 1958-04-22
•
Expires: 1973-09-04
Abstract
No abstract record available.
Inventors
- 👤 Guczky Stefan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:28
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; Y; Y10; Y10S; Y10S261/00; Y10S261/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1195521A
Cited
US725114A
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US1839927A
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US2066665A
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US2213052A
Cited
US2336833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |