US3228459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination cooling and sealed gas combustion heating unit
Assignee: Worthington Corp
•
Filing: 1964-06-12
•
Granted: 1966-01-11
•
Expires: 1984-06-12
Abstract
No abstract record available.
Inventors
- 👤 William G Crooker
- 👤 James O Fichtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:14
CPC Classifications
F; F24; F24F; F24F1/00; F24F1/02; F24F1/0373; F24F1/028; F24F1/0284; F24F1/032; F24F1/0323; F24F1/0328; F24F1/037
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2880718A
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US2886955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |