US3607212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A brown coal fertilizer product and process for preparing same
Assignee: Union Rheinische Braunkohlen Kraftstoff AG
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Filing: 1969-01-07
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Granted: 1971-09-21
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Expires: 1989-01-07
Abstract
Abstract Agents for improving the fertility of soil consisting of a mixture of brown coal and a material which is capable of being decomposed by bacteria such as Alpha -cellulose-containing waste residues, sugar-containing residues, sawdust and sewage sludge.
Inventors
- 👤 Gottfried Nettesheim
- 👤 Ernst Petzold
- 👤 Hermann Pruckner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:15
CPC Classifications
C; C05; C05F; C05F11/00; C05F11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
The process according to claim 1 wherein one or more fertilizers in small amounts are mixed with the brown coal and said material.
Claim 2
Dependent Claim
50 words
An agent for improving the fertility of the soil which comprises brown coal and a minor amount up to 15 percent by weight of a material selected from the group consisting of Alpha -celulose-containing waste residues of the cellulose industry, sugar-containing residues of the sugar industry, sawdust and sewage sludge.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |