US3193350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing higher polyphosphoric acids
Assignee: Knapsack AG
•
Filing: 1961-03-03
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Granted: 1965-07-06
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Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
- 👤 Beltz Klaus
- 👤 Rodis Franz
- 👤 Panter Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:03
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR THE PREPARATION OF POLYPHOSPHORIC ACIDS CONTAINING FROM ABOUT 72.4 PERCENT BY WEIGHT TO 87 PERCENT BY WEIGHT P2O5 WHICH COMPRISES: (A) BURNING IN A STATIONARY REACTION CHAMBER ELEMENTARY PHOSPHORUS WITH GASES CONTAINING OXYGEN TO FORM A HOT GAS STREAM CONTAINING P2O5, (B) PASSING THE RESULTING HOT GAS STREAM WHICH ACCUMULATES IN A BURNING ZONE WITHIN THE STATIONARY REACTION CHAMBER DOWNWARDLY AT A TEMPRATURE BETWEEN 200 AND 2,500*C. TO AN ABSORPTION ZONE WITHIN THE SAME STATIONARY REACTION CHAMBER,
Claim 2
Dependent Claim
80 words
A PROCESS FOR THE PREPARATION OF POLYPHOSPHORIC ACIDS CONTAINING FROM ABOUT 72.4 PERCENT BY WEIGHT TO 87 PERCENT BY WEIGHT P2O5 WHICH COMPRISES: (A) BURNING IN A STATIONARY REACTION CHAMBER ELEMENTARY PHOSPHORUS WITH GASES CONTAINING OXYGEN TO FORM A HOT GAS STREAM CONTAINING P2O5, (B) PASSING THE RESULTING HOT GAS STREAM WHICH ACCUMULATES IN A BURNING ZONE WITHIN THE STATIONARY REACTION CHAMBER DOWNWARDLY AT A TEMPRATURE BETWEEN 200 AND 2,500*C. TO AN ABSORPTION ZONE WITHIN THE SAME STATIONARY REACTION CHAMBER,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |