US2547880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for corrugating sheet material and forming laminated cellular units thereof
Assignee: Individual
•
Filing: 1949-08-09
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Granted: 1951-04-03
•
Expires: 1969-08-09
Abstract
No abstract record available.
Inventors
- 👤 Leonard S Meyer
- 👤 Eric K Ritterhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:03
CPC Classifications
B; B32; B32B; B32B27/00; B29; B29C; B29C53/00; B29C53/22; B29C53/24; B29C53/26; B29C53/265; B31; B31D; B31D3/00; B31D3/005; B31F; B31F1/00; B31F1/20; B31F1/22; B31F1/225; B29K; B29K2105/00; B29K2105/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/101
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) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |