Patent US2872290A successfully refreshed from Google Patents.
US2872290A
Expired / Lapsed
US
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Stabilizing sulphuric anhydride
Assignee: Compagnie de Saint Gobain SA
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Filing: 1956-08-29
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Granted: 1959-02-03
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Expires: 1976-08-29
Abstract
No abstract record available.
Inventors
- 👤 Blanchard Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:21
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
SULPHURIC ANHYDRIDE CONTAINING A STABILIZING AMOUNT OF AT LEAST ONE OF THE FOLLOWING COMPOUNDS:
Claim 2
Dependent Claim
14 words
SULPHURIC ANHYDRIDE CONTAINING A STABILIZING AMOUNT OF AT LEAST ONE OF THE FOLLOWING COMPOUNDS:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |