Patent US73221A successfully refreshed from Google Patents.
US73221A
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US
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Improvement in connecting the tubes with the heads of sdeface-condensees
Assignee: —
•
Filing: —
•
Granted: 1868-01-14
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Expires: 1885-01-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:20
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/02; B21D39/021; B21J; B21J15/00; B21J15/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915
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) | 1871-01-13 | 1871-07-15 | 1872-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1875-01-13 | 1875-07-15 | 1876-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1879-01-13 | 1879-07-15 | 1880-01-14 | $7700.00 | Window Closed / Lapsed |