US3033098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating tunnel
Assignee: National Steel Corp
•
Filing: 1959-11-13
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Granted: 1962-05-08
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Expires: 1979-11-13
Abstract
No abstract record available.
Inventors
- 👤 Peter T Gacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:19
CPC Classifications
F; F26; F26B; F26B9/00; F26B9/10; F26B9/103; F24; F24F; F24F7/00; F24F7/04; F24F7/06; F24F7/065; F26B9/06
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |