Patent US4446941A successfully refreshed from Google Patents.
Patent US2551446A successfully refreshed from Google Patents.
US2551446A
Expired / Lapsed
US
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Algaecidal composition comprising a water-soluble cupric salt and lignin sulfonate
Assignee: US Filter Wallace and Tiernan Inc
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Filing: 1947-11-19
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Granted: 1951-05-01
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Expires: 1967-11-19
Abstract
No abstract record available.
Inventors
- 👤 Marks Henry Clay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:29
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
AN ALGAECIDAL COMPOSITION COMPRISING A WATER SOLUBLE CUPRIC SALT, AND LIGNIN SULFONATE, SAID COMPOSITION BEING SUBSTANTIALLY FREE OF CARBONHYDRATES.
Claim 2
Dependent Claim
19 words
AN ALGAECIDAL COMPOSITION COMPRISING A WATER SOLUBLE CUPRIC SALT, AND LIGNIN SULFONATE, SAID COMPOSITION BEING SUBSTANTIALLY FREE OF CARBONHYDRATES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |