US1436686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preventing the formation of scale in steam boilers, evaporators, economizers, and the like
Assignee: ELISABETH MARGARET EMMA JOHANN
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Filing: 1922-02-04
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Granted: 1922-11-28
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Expires: 1942-02-04
Abstract
No abstract record available.
Inventors
- 👤 Schnetzer Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/48; C02F2303/00; C02F2303/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1925-11-27 | 1926-05-29 | 1926-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-11-27 | 1930-05-29 | 1930-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-11-27 | 1934-05-29 | 1934-11-28 | $7700.00 | Window Closed / Lapsed |