Patent US2458715A successfully refreshed from Google Patents.
US2458715A
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Method of preventing scaling
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1944-08-25
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Granted: 1949-01-11
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Expires: 1964-08-25
Abstract
No abstract record available.
Inventors
- 👤 William J Marencik
- 👤 Robert E Ahlf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:05
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49314; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US528156A
Cited
US1085768A
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US1190937A
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US1433213A
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GB300633A
Cited
US1898809A
Cited
US2321917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |