US3171389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace construction for low temperature operation
Assignee: Petro-Chem Development Co Inc
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Filing: 1963-09-05
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Granted: 1965-03-02
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Expires: 1983-09-05
Abstract
No abstract record available.
Inventors
- 👤 John W Throckmorton
- 👤 John S Wallis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:38
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/101; F17; F17C; F17C9/00; F17C9/02; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/20; F28F1/24; F28F1/30; F28F1/34; F28F1/36; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0119; F17C2201/0138; F17C2205/00; F17C2205/01; F17C2205/0153; F17C2205/018; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161
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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |