US1224700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-furnace.
Assignee: UNIT SYSTEM OF HEATING AND M'F'G Co
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Filing: 1916-03-13
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Granted: 1917-05-01
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Expires: 1936-03-13
Abstract
No abstract record available.
Inventors
- 👤 Charles Atherton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:03
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/006
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) | 1920-04-30 | 1920-10-30 | 1921-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-04-30 | 1924-10-30 | 1925-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-04-30 | 1928-10-30 | 1929-05-01 | $7700.00 | Window Closed / Lapsed |