US1759615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of steam-boiler water
Assignee: JOHN M HOPWOOD
•
Filing: 1926-12-04
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Granted: 1930-05-20
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Expires: 1946-12-04
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:00
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404
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) | 1933-05-19 | 1933-11-18 | 1934-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-05-19 | 1937-11-18 | 1938-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-05-19 | 1941-11-18 | 1942-05-20 | $7700.00 | Window Closed / Lapsed |