US3030091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary kiln with heat exchanger
Assignee: Harbison Walker Refractories Co
•
Filing: 1960-01-05
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Granted: 1962-04-17
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Expires: 1980-01-05
Abstract
No abstract record available.
Inventors
- 👤 Oscar M Wicken
- 👤 Leo L Gill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:03
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/28; F; F27; F27B; F27B7/00; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00117; B01J2219/0015; B01J2219/00155
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) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |