US4048433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose ethers having a low molecular weight and a high degree of methyl substitution
Assignee: Procter and Gamble Co
•
Filing: 1976-02-02
•
Granted: 1977-09-13
•
Expires: 1996-02-02
Abstract
Abstract Novel cellulose ethers having a molecular weight from 3000 to 10,000 and a methyl degree of substitution of from 1.8 to 2.7 are especially useful as soil release agents in detergent compositions.
Inventors
- 👤 Michael E. Burns
- 👤 Hans J. Pracht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:19
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0036; C08; C08B; C08B11/00; C08B11/02; C11D3/16; C11D3/20; C11D3/22; C11D3/222; C11D3/225
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
A methyl cellulose ether having the structure ##STR2## wherein R' is hydrogen or methyl provided the average degree of methyl substitution on the anhydroglucose unit is from 1.8 to 2.7 and n ranges from 14 to 54.
Claim 2
Dependent Claim
37 words
A methyl cellulose ether having the structure ##STR2## wherein R' is hydrogen or methyl provided the average degree of methyl substitution on the anhydroglucose unit is from 1.8 to 2.7 and n ranges from 14 to 54.
Claim 3
Dependent Claim
16 words
The methyl cellulose ether of claim 1 wherein the molecular weight is from 3500 to 8000.
Claim 4
Dependent Claim
16 words
The methyl cellulose ether of claim 2 wherein the molecular weight is from 4000 to 5500.
Claim 5
Dependent Claim
16 words
The methyl cellulose ether of claim 3 wherein the DS methyl is from 2.1 to 2.4.
References Cited (Backward Citations)
US2159377A
Cited
US2159375A
Cited
US2523377A
Cited
US2510153A
Cited
GB659506A
Cited
US2994665A
Cited
US3391135A
Cited
GB1139637A
Cited
US3523088A
Cited
GB1171877A
Cited
US3728331A
Cited
US3668000A
Cited
ZA715149B
Cited
US3920561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |