US2926658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter type furnace observation port
Assignee: Individual
•
Filing: 1957-07-19
•
Granted: 1960-03-01
•
Expires: 1977-07-19
Abstract
No abstract record available.
Inventors
- 👤 Ligon Cleon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:48
CPC Classifications
F; F27; F27D; F27D21/00; F27D21/02; F23; F23M; F23M11/00; F23M11/04; F23M11/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1604811A
Cited
US1938022A
Cited
US1999782A
Cited
US2112063A
Cited
US2197637A
Cited
US2434924A
Cited
US2440938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |