US2631835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for heating gases
Assignee: Phillips Petroleum Co
•
Filing: 1948-04-26
•
Granted: 1953-03-17
•
Expires: 1968-04-26
Abstract
No abstract record available.
Inventors
- 👤 Edward L Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:34
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/02; Y; Y10; Y10S; Y10S159/00; Y10S159/29
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US629520A
Cited
US1046307A
Cited
US1738270A
Cited
US1905185A
Cited
US2244612A
Cited
US2417049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |