US2497914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for forming negative surface
Assignee: —
•
Filing: —
•
Granted: 1950-02-21
•
Expires: 1967-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:02
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/50; B28; B28B; B28B21/00; B28B21/86; B28B21/88; B28B7/00; B28B7/28; B28B7/30; B29C33/38; B29C33/3842; B29C33/3857; B29C33/40; B29C33/405; Y; Y10; Y10S; Y10S264/00; Y10S264/50; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |