US1028555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination-boiler for heating apparatus and hot-water supply.
Assignee: Individual
•
Filing: 1911-06-12
•
Granted: 1912-06-04
•
Expires: 1931-06-12
Abstract
No abstract record available.
Inventors
- 👤 Henry Barber Donald
- 👤 Edwin Spragg Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:30
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/28
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) | 1915-06-04 | 1915-12-04 | 1916-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1919-06-04 | 1919-12-04 | 1920-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1923-06-04 | 1923-12-04 | 1924-06-04 | $7700.00 | Window Closed / Lapsed |