US3404209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace construction and utilization
Assignee: Individual
•
Filing: 1965-05-25
•
Granted: 1968-10-01
•
Expires: 1985-05-25
Abstract
No abstract record available.
Inventors
- 👤 Brooke Frank Wharton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:47
CPC Classifications
F; F27; F27D; F27D11/00; F27D11/08; F27B; F27B3/00; F27B3/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
CA575478A
Cited
US1735419A
Cited
US2271045A
Cited
US2396663A
Cited
US2766736A
Cited
US2801156A
Cited
US2868860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |