Patent US2828345A successfully refreshed from Google Patents.
US2828345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxypolyoxyethylene diethers of polyoxybutylene glycols
Assignee: Dow Chemical Co
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Filing: 1955-04-27
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Granted: 1958-03-25
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Expires: 1975-04-27
Abstract
No abstract record available.
Inventors
- 👤 John S Spriggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:34
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/008; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A HYDROXYPOLYOXYETHYLENE DIETHER OF A POLYOXYBUTYLENE GLYCOL WHEREIN THE POLYOXYBUTYLENE PORTION OF THE COMPOUND CONTRIBUTES GREATER THAN 1000 BUT NOT MORE THAN ABOUT 2000 TO ITS MOLECULAR WEIGHT AND THE POLYOXYETHYLENE PORTIONS CONTRIBUTE FROM 20 TO 90 PERCENT BY WEIGHT OF THE COMPOUND.
Claim 2
Dependent Claim
43 words
A HYDROXYPOLYOXYETHYLENE DIETHER OF A POLYOXYBUTYLENE GLYCOL WHEREIN THE POLYOXYBUTYLENE PORTION OF THE COMPOUND CONTRIBUTES GREATER THAN 1000 BUT NOT MORE THAN ABOUT 2000 TO ITS MOLECULAR WEIGHT AND THE POLYOXYETHYLENE PORTIONS CONTRIBUTE FROM 20 TO 90 PERCENT BY WEIGHT OF THE COMPOUND.
References Cited (Backward Citations)
US2174761A
Cited
US2674619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |