Patent US2766677A successfully refreshed from Google Patents.
US2766677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue control devices adapted for combustion heaters
Assignee: Individual
•
Filing: 1950-07-21
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Granted: 1956-10-16
•
Expires: 1970-07-21
Abstract
No abstract record available.
Inventors
- 👤 Silverman Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:35
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/001; F24C15/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US5182A
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US275828A
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US281286A
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US662738A
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GB190016301A
Cited
US889068A
Cited
GB191312390A
Cited
US1162205A
Cited
FR550159A
Cited
FR802964A
Cited
US2535545A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |