US2051663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of obtaining perforations in metal
Assignee: Individual
•
Filing: 1933-12-30
•
Granted: 1936-08-18
•
Expires: 1953-12-30
Abstract
No abstract record available.
Inventors
- 👤 Werth Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:05
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; D01D4/022; C; C25; C25D; C25D1/00; Y; Y10; Y10S; Y10S29/00; Y10S29/012
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) | 1939-08-18 | 1940-02-17 | 1940-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-18 | 1944-02-17 | 1944-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-18 | 1948-02-17 | 1948-08-18 | $7700.00 | Window Closed / Lapsed |