US518864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary heater
Assignee: —
•
Filing: —
•
Granted: 1894-04-24
•
Expires: 1911-04-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:49
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; Y; Y10; Y10S; Y10S165/00; Y10S165/327; Y10S165/331; Y10S165/335; Y10S165/336
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) | 1897-04-23 | 1897-10-23 | 1898-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1901-04-24 | 1901-10-24 | 1902-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1905-04-24 | 1905-10-24 | 1906-04-25 | $7700.00 | Window Closed / Lapsed |