Patent US1621571A successfully refreshed from Google Patents.
US1621571A
Expired / Lapsed
US
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Pulverizer
Assignee: Babcock and Wilcox Co
•
Filing: 1923-05-25
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Granted: 1927-03-22
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Expires: 1943-05-25
Abstract
No abstract record available.
Inventors
- 👤 Witz Henri Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:04
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/288
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) | 1930-03-21 | 1930-09-20 | 1931-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-03-21 | 1934-09-20 | 1935-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-03-21 | 1938-09-20 | 1939-03-22 | $7700.00 | Window Closed / Lapsed |