US2097649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and material for treating boiler water
Assignee: Individual
•
Filing: 1935-12-31
•
Granted: 1937-11-02
•
Expires: 1955-12-31
Abstract
No abstract record available.
Inventors
- 👤 Thorvald A Solberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/105; Y; Y10; Y10S; Y10S159/00; Y10S159/04; Y10S203/00; Y10S203/18
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) | 1940-11-01 | 1941-05-03 | 1941-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-11-01 | 1945-05-03 | 1945-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-11-01 | 1949-05-03 | 1949-11-02 | $7700.00 | Window Closed / Lapsed |