Patent US2667338A successfully refreshed from Google Patents.
US2667338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hemfort
Assignee: —
•
Filing: —
•
Granted: 1954-01-26
•
Expires: 1971-01-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
B; B04; B04B; B04B11/00; B04B11/08; B04B11/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US814720A
Cited
US1624037A
Cited
US1771321A
Cited
US2171136A
Cited
US2273835A
Cited
US2318293A
Cited
US2341536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |