US2630439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compounds for altering surface characteristics of liquids
Assignee: Dearborn Chemical Co
•
Filing: 1949-08-31
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Granted: 1953-03-03
•
Expires: 1969-08-31
Abstract
No abstract record available.
Inventors
- 👤 Lewis O Gunderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:51
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
15 words
A COMPOUND CAPABLE OF ALTERING THE SURFACE CHARACTERISTICS OF LIQUIDS, SAID COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
US2036304A
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US2114122A
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US2250407A
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GB568318A
Cited
US2461730A
Cited
US2481899A
Cited
US2408527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |