Patent US3661829A successfully refreshed from Google Patents.
US3661829A
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Aqueous sulfo modified melamine-form-aldehyde resin composition containing multivalent oxides
Assignee: SUDDENTSCHE KALKSTICKSTOFF WER
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Filing: 1970-05-06
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Granted: 1972-05-09
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Expires: 1990-05-06
Abstract
Abstract AN AQUEOUS SOLUTION OF A MELAMINE-FORMALDEHYDE RESIN CONTAINING ENOUGH SULFO GROUPS TO BE WATER SOLUBLE COMBINED WITH ONE OR MORE BASIC OR AMPHOTERIC OXIDES OR HYDROXIDES OF TRIVALENT OR QUADRIVALENT METALS IS A STRONG BINDER FOR SAND, CEMENT, AND THE LIKE.
Inventors
- 👤 Alois Aignesberger
- 👤 Horst Michaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:28
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; C04B24/00; C04B24/16; C04B24/20; C04B24/22; C04B26/00; C04B26/02; C04B26/10; C04B26/12; C04B26/125; C04B28/003; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C04B2103/00; C04B2103/0004; C04B2103/0021
Claims Analysis
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |