Patent US2808435A successfully refreshed from Google Patents.
US2808435A
Expired / Lapsed
US
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Chelating agent
Assignee: Refined Products Corp
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Filing: 1953-12-11
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Granted: 1957-10-01
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Expires: 1973-12-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter T Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:27
CPC Classifications
C; C05; C05D; C05D9/00; C05D9/02; C07; C07C; C07C231/00; C07C231/12; C11; C11D; C11D3/00; C11D3/16; C11D3/26; C11D3/33; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
AS A PRODUCT OF MANUFACTURE, A WATER-SOLUBLE CHELATING AGENT CONSISTING ESSENTIALLY OF AN ALKALI METAL SALT OF A POLYCARBOXYLIC AMINO ACID OF THE GENERAL FORMULA
Claim 2
Dependent Claim
25 words
AS A PRODUCT OF MANUFACTURE, A WATER-SOLUBLE CHELATING AGENT CONSISTING ESSENTIALLY OF AN ALKALI METAL SALT OF A POLYCARBOXYLIC AMINO ACID OF THE 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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |