Patent US157807A successfully refreshed from Google Patents.
US157807A
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Improvement in blank-bars for elliptic spring-heads
Assignee: —
•
Filing: —
•
Granted: 1874-12-15
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Expires: 1891-12-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:15
CPC Classifications
F; F17; F17C; F17C1/00; F17C1/02; F17C1/04; F17C1/06; B; B01; B01J; B01J3/00; B01J3/04; B01J3/048; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49607; Y10T428/00; Y10T428/12; Y10T428/12188; Y10T428/12389; Y10T428/12403; Y10T428/24; Y10T428/24479; Y10T428/2457
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) | 1877-12-14 | 1878-06-15 | 1878-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1881-12-14 | 1882-06-15 | 1882-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1885-12-14 | 1886-06-15 | 1886-12-15 | $7700.00 | Window Closed / Lapsed |