US2500499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for and method of heating flowing media
Assignee: Shell Development Co
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Filing: 1948-02-21
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Granted: 1950-03-14
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Expires: 1968-02-21
Abstract
No abstract record available.
Inventors
- 👤 Johannes A Schuurman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:07
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/14; C10G9/18; C10G9/20; B; B01; B01J; B01J19/00; B01J19/18; B01J19/1868; B01J19/1875; B01J19/24; B01J19/2415; B01J19/2425; B01J19/2455; B01J19/246; B01J8/00; B01J8/02; B01J8/06; B01J8/062; C07; C07C; C07C17/00; C07C17/25; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00477; B01J2208/00495; B01J2208/00504; B01J2208/02; B01J2208/021; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/0015; B01J2219/00155; B01J2219/00157; B01J2219/00761; B01J2219/00763; B01J2219/00765; B01J2219/00768
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |