US3644535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acetylenic ethers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-07-24
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Granted: 1972-02-22
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Expires: 1989-07-24
Abstract
Abstract POLY(OXYPROPYLENE) AND POLY(OXYETHYLENE/OXYPROPYLENE) DERIVATIVES OF CERTAIN ACETYLENIC ALCOHOLS, A PROCESS FOR THEIR MANUFACTURE AND THEIR USE AS CORROSION-RESTRAINING COMPOUNDS IN ACID-PICKLING BATHS FOR FERROUS METALS. THE COMPOUNDS ARE PARTICULARLY SUITABLE FOR USE IN HYDROCHLORIC ACID BATHS AND THEY HAVE LITTLE TENDENCY TO FOAM.
Inventors
- 👤 John Woolley Batty
- 👤 Eric Milton Chadwick
- 👤 James William Crook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:49
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/66; C11D1/722; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; C08G65/2609; C11D1/72; C11D3/00; C11D3/16; C11D3/164; C23; C23G; C23G1/00; C23G1/02; C23G1/04; C23G1/06; C23G1/068
Claims Analysis
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |