US1246522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner.
Assignee: PITTSBURG WATER HEATER Co
•
Filing: 1916-06-01
•
Granted: 1917-11-13
•
Expires: 1936-06-01
Abstract
No abstract record available.
Inventors
- 👤 Charles A Backstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:06
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
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) | 1920-11-12 | 1921-05-14 | 1921-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-11-12 | 1925-05-14 | 1925-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-11-12 | 1929-05-14 | 1929-11-13 | $7700.00 | Window Closed / Lapsed |