US2979464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perborate granulation
Assignee: Evonik Operations GmbH
•
Filing: 1957-11-04
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Granted: 1961-04-11
•
Expires: 1977-11-04
Abstract
No abstract record available.
Inventors
- 👤 Pistor Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:49
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D11/00; C11D17/00; C11D17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS FOR THE GRANULATION OF FINELY DIVIDED SODIUM PERBORATE TETRAHYDRATE CONTAINING MATERIAL TO PRODUCE GRANULES OF AN AVERAGE PARTICLE SIZE BETWEEN 0.3 AND 1.5 MM. WHICH COMPRISES SUBJECTING SUCH MATERIAL IN MOISTENED STATE TO THE VIGOROUS ACTION OF A PLURALITY OF ROTATING STIRRING ARMS ROTATING AT A SPEED OF AT LEAST 200 R.P.M. UNTIL A MOIST GRANULAR PRODUCT IS OBTAINED AND DRYING THE MOIST GRANULAR PRODUCT IN A ROTARY DRUM DRIER.
Claim 2
Dependent Claim
72 words
A PROCESS FOR THE GRANULATION OF FINELY DIVIDED SODIUM PERBORATE TETRAHYDRATE CONTAINING MATERIAL TO PRODUCE GRANULES OF AN AVERAGE PARTICLE SIZE BETWEEN 0.3 AND 1.5 MM. WHICH COMPRISES SUBJECTING SUCH MATERIAL IN MOISTENED STATE TO THE VIGOROUS ACTION OF A PLURALITY OF ROTATING STIRRING ARMS ROTATING AT A SPEED OF AT LEAST 200 R.P.M. UNTIL A MOIST GRANULAR PRODUCT IS OBTAINED AND DRYING THE MOIST GRANULAR PRODUCT IN A ROTARY DRUM DRIER.
References Cited (Backward Citations)
US2367971A
Cited
US1978953A
Cited
US2034361A
Cited
US1965304A
Cited
US2145015A
Cited
US2308992A
Cited
US2706178A
Cited
DE848071C
Cited
US2874123A
Cited
US2876200A
Cited
US2895916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |