US2961732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheating section for tunnel kiln and method
Assignee: Individual
•
Filing: 1957-06-18
•
Granted: 1960-11-29
•
Expires: 1977-06-18
Abstract
No abstract record available.
Inventors
- 👤 William L Hanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:55
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/12; F27B2009/122; F27D; F27D19/00; F27D2019/0028; F27D2019/0068
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1858008A
Cited
US1923729A
Cited
US2544947A
Cited
US2590757A
Cited
GB630293A
Cited
US2550807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |