US2636721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam pressure control for directcontact heaters operating on variable pressure steam
Assignee: Worthington Corp
•
Filing: 1950-05-22
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Granted: 1953-04-28
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Expires: 1970-05-22
Abstract
No abstract record available.
Inventors
- 👤 Spining Warren Pierson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/28; F22D1/30; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567; Y10T137/2569
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE307266C
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DE387584C
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US642088A
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US2029505A
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US2085782A
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US2372087A
Cited
US2489345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |