US2791231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graduating unit
Assignee: —
•
Filing: —
•
Granted: 1957-05-07
•
Expires: 1974-05-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:12
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/02; E03C1/04; F; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/044; E03C1/0408; D06F2212/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-06 | 1960-11-05 | 1961-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-06 | 1964-11-05 | 1965-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-06 | 1968-11-05 | 1969-05-07 | $7700.00 | Window Closed / Lapsed |