Patent US3685581A successfully refreshed from Google Patents.
Patent US1510693A successfully refreshed from Google Patents.
US1510693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverized-coal-burning apparatus
Assignee: PULVERIZED COAL EQUIPMENT Corp
•
Filing: 1921-02-16
•
Granted: 1924-10-07
•
Expires: 1941-02-16
Abstract
No abstract record available.
Inventors
- 👤 Paul C Mulligan
- 👤 Frederick S Brinton
- 👤 Helmuth W Schmitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:30
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/30; F26B17/18; F26B17/22; F26B23/00; F26B23/02; F26B23/028
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1927-10-07 | 1928-04-07 | 1928-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-10-07 | 1932-04-07 | 1932-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-10-07 | 1936-04-07 | 1936-10-07 | $7700.00 | Window Closed / Lapsed |