Patent US2920950A successfully refreshed from Google Patents.
US2920950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soil additive and process for fertilizing and conditioning soil
Assignee: AO Smith Corp
•
Filing: 1955-10-10
•
Granted: 1960-01-12
•
Expires: 1975-10-10
Abstract
No abstract record available.
Inventors
- 👤 Lorenz W Heise
- 👤 Johnson Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/53; C; C05; C05D; C05D3/00; C05D9/00; C05D9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS OF CONDITIONING AND FERTILIZING SOIL COMPRISING, ADDING TO THE SOIL A MATERIAL CONSISTING ESSENTIALLY BY WEIGHT OF ABOUT 25% TO 40% BY WEIGHT OF FERRIC HYDROXIDE, UP TO 1% OF TRACE ELEMENTS AND FROM 59-79% BY WEIGHT OF CALCIUM SULPHATE, SAID MATERIAL PRODUCED BY THE TREATMENT OF WASTE PICKLE LIQUOR CONTAINING SUL-
Claim 2
Dependent Claim
54 words
A PROCESS OF CONDITIONING AND FERTILIZING SOIL COMPRISING, ADDING TO THE SOIL A MATERIAL CONSISTING ESSENTIALLY BY WEIGHT OF ABOUT 25% TO 40% BY WEIGHT OF FERRIC HYDROXIDE, UP TO 1% OF TRACE ELEMENTS AND FROM 59-79% BY WEIGHT OF CALCIUM SULPHATE, SAID MATERIAL PRODUCED BY THE TREATMENT OF WASTE PICKLE LIQUOR CONTAINING SUL-
References Cited (Backward Citations)
US2165344A
Cited
US2350982A
Cited
US2532548A
Cited
US2713749A
Cited
US2754623A
Cited
US2741876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |