US1438259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater
Assignee: Individual
•
Filing: 1918-09-11
•
Granted: 1922-12-12
•
Expires: 1938-09-11
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Pilcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:41
CPC Classifications
F; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007
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) | 1925-12-11 | 1926-06-12 | 1926-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-12-11 | 1930-06-12 | 1930-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-12-11 | 1934-06-12 | 1934-12-12 | $7700.00 | Window Closed / Lapsed |