US3448971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon baking furnaces
Assignee: Dresser Industries Inc
•
Filing: 1968-01-26
•
Granted: 1969-06-10
•
Expires: 1988-01-26
Abstract
No abstract record available.
Inventors
- 👤 Albert Lajos Renkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:25
CPC Classifications
F; F27; F27B; F27B13/00; F27B13/02; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1929073A
Cited
US2186223A
Cited
US2480359A
Cited
US2704419A
Cited
US3048382A
Cited
US3240479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |