Patent US2138229A successfully refreshed from Google Patents.
US79436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvement in steam safety-valves
Assignee: —
•
Filing: —
•
Granted: 1868-06-30
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Expires: 1885-06-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:24
CPC Classifications
A; A47; A47J; A47J27/00; A47J27/08; A47J27/09; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7834; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7921
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) | 1871-06-30 | 1871-12-30 | 1872-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1875-06-30 | 1875-12-30 | 1876-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1879-06-30 | 1879-12-30 | 1880-06-30 | $7700.00 | Window Closed / Lapsed |