Patent US33849A successfully refreshed from Google Patents.
US33849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in heaters
Assignee: —
•
Filing: —
•
Granted: 1861-12-03
•
Expires: 1878-12-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:20
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/03; Y; Y10; Y10S; Y10S15/00; Y10S15/02; 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) | 1864-12-02 | 1865-06-03 | 1865-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1868-12-02 | 1869-06-03 | 1869-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1872-12-02 | 1873-06-03 | 1873-12-03 | $7700.00 | Window Closed / Lapsed |