Patent US2647738A successfully refreshed from Google Patents.
US2647738A
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US
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Heating powdered material
Assignee: Shell Development Co
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Filing: 1950-12-08
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Granted: 1953-08-04
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Expires: 1970-12-08
Abstract
No abstract record available.
Inventors
- 👤 Richard P Trainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:59
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; B01J8/00; B01J8/18; B01J8/1836; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00212; B01J2208/00477; B01J2208/00495; B01J2208/00504; B01J2208/0053; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/0015; B01J2219/00155
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1953938A
Cited
US1927493A
Cited
US2418394A
Cited
GB588743A
Cited
US2540806A
Cited
US2436464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |