Patent US2821538A successfully refreshed from Google Patents.
US2821538A
Expired / Lapsed
US
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Novel carbonic acid diesters of an aliphatic alcohol and a polyglycol monoether
Assignee: Texaco Inc
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Filing: 1956-01-18
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Granted: 1958-01-28
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Expires: 1976-01-18
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Dille
- 👤 Robert Y Heisler
- 👤 Stanley R Newman
- 👤 Alpert Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:41
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10N; C10N2020/00; C10N2020/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
CARBONIC ACID DIESTERS OF AN ALIPHATIC ALCOHOL AND A POLYGLYCOL MONOETHER HAVING THE FOLLOWING GENERAL FORMULA
Claim 2
Dependent Claim
16 words
CARBONIC ACID DIESTERS OF AN ALIPHATIC ALCOHOL AND A POLYGLYCOL MONOETHER HAVING THE FOLLOWING GENERAL FORMULA
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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |