Patent US2864591A successfully refreshed from Google Patents.
US2864591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated tubing
Assignee: Calumet and Hecla Inc
•
Filing: 1956-07-02
•
Granted: 1958-12-16
•
Expires: 1976-07-02
Abstract
No abstract record available.
Inventors
- 👤 Russell M Frink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:26
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE221024C
Cited
NL37124C
Cited
US1315853A
Cited
GB219788A
Cited
US1842095A
Cited
US1913573A
Cited
US1993095A
Cited
US2068958A
Cited
US2139367A
Cited
US2252045A
Cited
US2362694A
Cited
US2417661A
Cited
US2621900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |