US2598447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam hydrator
Assignee: DAVID A FREEMAN Corp
•
Filing: 1948-12-31
•
Granted: 1952-05-27
•
Expires: 1968-12-31
Abstract
No abstract record available.
Inventors
- 👤 Roy M Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:39
CPC Classifications
D; D06; D06B; D06B23/00; D06B23/20; D06B23/205; Y; Y10; Y10S; Y10S261/00; Y10S261/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2391663A
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US2445592A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |