US2933122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cellular core material from fluted stock
Assignee: Individual
•
Filing: 1957-04-29
•
Granted: 1960-04-19
•
Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Charles W Christman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:40
CPC Classifications
B; B21; B21D; B21D47/00; Y; Y10; Y10S; Y10S493/00; Y10S493/966; Y10T; Y10T29/00; Y10T29/18; Y10T29/185; Y10T29/49; Y10T29/49826; Y10T29/49879; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165
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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |