Patent US412830A successfully refreshed from Google Patents.
US412830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for testing and graduating vacuum-gages
Assignee: —
•
Filing: —
•
Granted: 1889-10-15
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Expires: 1906-10-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
G; G01; G01L; G01L27/00
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) | 1892-10-14 | 1893-04-15 | 1893-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1896-10-14 | 1897-04-15 | 1897-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1900-10-15 | 1901-04-16 | 1901-10-16 | $7700.00 | Window Closed / Lapsed |