US1636907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater
Assignee: AUGUST J HARTFIELD
•
Filing: 1924-07-15
•
Granted: 1927-07-26
•
Expires: 1944-07-15
Abstract
No abstract record available.
Inventors
- 👤 Albert L Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:02
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/16; F24H1/165
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) | 1930-07-25 | 1931-01-24 | 1931-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-07-25 | 1935-01-24 | 1935-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-07-25 | 1939-01-24 | 1939-07-26 | $7700.00 | Window Closed / Lapsed |