Patent US2821536A successfully refreshed from Google Patents.
US2821536A
Expired / Lapsed
US
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Production of wetting, emulsifying and washing agent
Assignee: Ruhrchemie AG
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Filing: 1954-02-10
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Granted: 1958-01-28
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Expires: 1974-02-10
Abstract
No abstract record available.
Inventors
- 👤 Feichtinger Hans
- 👤 Tummes Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:20
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/13; C07C309/14; C07C309/15; C07C309/17; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
PROCESS FOR THE PRODUCTION OF WETTING, EMULSIFYING, AND WASHING AGENTS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
14 words
PROCESS FOR THE PRODUCTION OF WETTING, EMULSIFYING, AND WASHING AGENTS 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) | 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 |