US3377939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivotable chimney cap having interiorly operating means
Assignee: DERWARD E SAILORS
•
Filing: 1967-04-03
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Granted: 1968-04-16
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Expires: 1987-04-03
Abstract
No abstract record available.
Inventors
- 👤 Derward E Sailors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:15
CPC Classifications
F; F23; F23J; F23J13/00; F23J13/08
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) | 1971-04-16 | 1971-10-16 | 1972-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-16 | 1975-10-16 | 1976-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-16 | 1979-10-16 | 1980-04-16 | $7700.00 | Window Closed / Lapsed |