US2998764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed heater venting system
Assignee: WILLIAMS FURNACE Co
•
Filing: 1960-09-13
•
Granted: 1961-09-05
•
Expires: 1980-09-13
Abstract
No abstract record available.
Inventors
- 👤 Karl L Bedell
- 👤 Charles R Fields
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:53
CPC Classifications
F; F24; F24C; F24C15/00; F24C15/001; F24C15/002; F23; F23J; F23J13/00; F23J13/04; F23L; F23L17/00; F23L17/02; F23L17/04; F23J2213/00; F23J2213/20; F23J2213/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CH240743A
Cited
US2755794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |