US3708436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detergent builders
Assignee: ChampionX LLC
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Filing: 1969-12-12
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Granted: 1973-01-02
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Expires: 1989-12-12
Abstract
Abstract A SYNERGISTIC MIXTURE OF POLYMERIC MALEIC ANHYDEIDE (PMA) WITH SODIUM NITRILOTRIACETATE (NTA) OR SODIUM TRIPOLYPHOSPHATE (STP) IS EMPLOYED AS A DETERGENT BUILDER WITH OR WITHOUT PURIFICATION OF THE PMA. MALEIC ANHYDRIDE ALSO HAS A SYNERGISTIC EFFECT WITH PURIFIED- PMA. NTA HAS A SYNERGISTIC EFFECT WITH MALEIC ANHYDRIDE-METHACRYLATE COPOLYMERS, VINYL ACETATE-MALEIC ANHYDRIDE COPOLYMERS, AND WITH STYRENE-MALEIC ANHYDRIDE COPOLYMERS.
Inventors
- 👤 R Thompson
- 👤 P Pappas
- 👤 J Sandri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:47
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C11D3/26; C11D3/33
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |