Patent US3580852A successfully refreshed from Google Patents.
US3580852A
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Detergent formulations containing tetrahydrofuran 2,3,4,5 - tetracarboxylic acid salts as builders
Assignee: Ethyl Corp
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Filing: 1969-05-19
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Granted: 1971-05-25
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Expires: 1989-05-19
Abstract
Abstract TO OBVIATE EUTROPHICATION OF WATER, NON-PHOSPHORUS DETERGENT BUILDERS ARE PROVIDED. THESE ARE THE WATERSOLUBLE SALTS OF TETRAHYDROFURAN 2,3,4,5-TETRACARBOXYLIC ACID (E.G., THE TETRASODIUM SALT THEREOF). CONVENTIONAL DETERGENT ACTIVES MAY BE USED WITH THESE BUILDERS.
Inventors
- 👤 Meiling T Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:56
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2096; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/18; C07D307/24
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |