Patent JPS63251740A successfully refreshed from Google Patents.
US2768089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clay soil improved by an alkylene polyamine
Assignee: General Mills Inc
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Filing: 1952-10-13
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Granted: 1956-10-23
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Expires: 1972-10-13
Abstract
No abstract record available.
Inventors
- 👤 John G Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:50
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/16; C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/40; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
CLAY SOIL CONDITIONED WITH AN ALKYLENE POLYAMINE.
Claim 2
Dependent Claim
7 words
CLAY SOIL CONDITIONED WITH AN ALKYLENE POLYAMINE.
References Cited (Backward Citations)
US2323928A
Cited
GB578694A
Cited
US2378235A
Cited
US2436694A
Cited
US2534713A
Cited
US2508924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |