Patent US4017541A successfully refreshed from Google Patents.
US4017541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic builder
Assignee: Lever Brothers Co
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Filing: 1975-09-15
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Granted: 1977-04-12
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Expires: 1995-09-15
Abstract
Abstract Particular, novel (dicarboxy)alkyl ethers are useful as builder ingredients in detergent compositions.
Inventors
- 👤 Christopher Edward Stubbs
- 👤 Jacobus Roelof Nooi
- 👤 Hermanus Christoffel Kemper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:07
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2089; C07; C07C; C07C59/00; C07C59/235; C07C59/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
Novel tartaric acid dimalonyl ethers, useful as builders in detergent compositions, of the following formula: ##STR15##in which M = H, --CH 3 , --C 2 H 5 , Na or K.
Claim 2
Dependent Claim
31 words
Novel tartaric acid dimalonyl ethers, useful as builders in detergent compositions, of the following formula: ##STR15##in which M = H, --CH 3 , --C 2 H 5 , Na or K.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |