US137357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in feeders and filters for boilers
Assignee: —
•
Filing: —
•
Granted: 1873-04-01
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Expires: 1890-04-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:04
CPC Classifications
E; E02; E02B; E02B3/00; E02B3/04; E02B3/043; G; G05; G05D; G05D7/00; G05D7/01; G05D7/0166; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86236; Y10T137/86252
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) | 1876-03-31 | 1876-09-30 | 1877-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1880-03-31 | 1880-09-30 | 1881-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1884-03-31 | 1884-09-30 | 1885-04-01 | $7700.00 | Window Closed / Lapsed |