Patent US3637869A successfully refreshed from Google Patents.
US3637869A
Expired / Lapsed
US
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Nonionic biodegradable foam control agent
Assignee: BASF Corp
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Filing: 1969-06-02
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Granted: 1972-01-25
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Expires: 1989-06-02
Abstract
Abstract DISCLOSED HEREIN ARE NONIONIC BIODEGRADABLE FOAM CONTROL AGENTS PREPARED FROM THE SPECIFIC SEQUENTIAL REACTION OF (A) A POLYFUNCTIONAL INITIATOR AND AN ALKYLENE OXIDE HAVING FROM TEN TO TWENTY CARBON ATOMS, AND (B) THE PRODUCT OF (A) AND MIXTURES OF LOWER ALKYLENE OXIDES, EACH HAVING FROM TWO TO FOUR CARBON ATOMS TO YIELD A SUBSTANTIALLY HYDROPHOBIC FINAL PRODUCT HAVING A MOLECULAR WEIGHT OF FROM 1,000 TO 2,000 WHICH EXHIBITS SUFFICIENT HYDROPHILIC CHARACTERISTICS TO BE PARTIALLY WATERSOLUBLE.
Inventors
- 👤 Reinhold K Seizinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:23
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0026; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C11D1/00; C11D1/66; C11D1/722
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |