US2661200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device in heat exchanger
Assignee: Industrikemiska AB
•
Filing: 1949-09-15
•
Granted: 1953-12-01
•
Expires: 1969-09-15
Abstract
No abstract record available.
Inventors
- 👤 Ohlander Kjell Per Arne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:31
CPC Classifications
C; C21; C21B; C21B9/00; C21B9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB104657A
Cited
US1709358A
Cited
US1762319A
Cited
US1975096A
Cited
US2011554A
Cited
US2081927A
Cited
US2126557A
Cited
US2268558A
Cited
US2365194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |