US2699758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preheating combustion supporting air for steam generating plants
Assignee: Svenska Maskinverken AB
•
Filing: 1950-07-11
•
Granted: 1955-01-18
•
Expires: 1970-07-11
Abstract
No abstract record available.
Inventors
- 👤 Dalin David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:39
CPC Classifications
F; F23; F23L; F23L15/00; F23L15/04; F23L15/045; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1741567A
Cited
US1819174A
Cited
US1753363A
Cited
US1837713A
Cited
GB299436A
Cited
US1840836A
Cited
US1833130A
Cited
US1975519A
Cited
FR729409A
Cited
US2170345A
Cited
US2424587A
Cited
GB575509A
Cited
GB629298A
Cited
GB633361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-17 | 1958-07-19 | 1959-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-17 | 1962-07-19 | 1963-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-17 | 1966-07-19 | 1967-01-18 | $7700.00 | Window Closed / Lapsed |