Patent US1284167A successfully refreshed from Google Patents.
US1284167A
Expired / Lapsed
US
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Contact process and apparatus for producing sulfuric acid.
Assignee: International Precipitation Co
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Filing: 1916-11-22
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Granted: 1918-11-05
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Expires: 1936-11-22
Abstract
No abstract record available.
Inventors
- 👤 Harry V Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:34
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/765; C01B17/7655
Claims Analysis
Total Claims: 0
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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) | 1921-11-04 | 1922-05-06 | 1922-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1925-11-04 | 1926-05-06 | 1926-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1929-11-04 | 1930-05-06 | 1930-11-05 | $7700.00 | Window Closed / Lapsed |