US145591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in feed-water heaters
Assignee: —
•
Filing: —
•
Granted: 1873-12-16
•
Expires: 1890-12-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/0031; F28D9/0043; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/40; Y10S165/439
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) | 1876-12-15 | 1877-06-16 | 1877-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1880-12-15 | 1881-06-16 | 1881-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1884-12-15 | 1885-06-16 | 1885-12-16 | $7700.00 | Window Closed / Lapsed |