US2415391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making gas masks
Assignee: Beckwith Manufacturing Co
•
Filing: 1942-10-22
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Granted: 1947-02-04
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Expires: 1962-10-22
Abstract
No abstract record available.
Inventors
- 👤 Stanley P Lovell
- 👤 William H Lehmberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:18
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/02; A62B18/025; B; B29; B29D; B29D99/00; B29D99/0064; B29D99/0071; D; D21; D21J; D21J7/00; B29L; B29L2031/00; B29L2031/48; B29L2031/4807; B29L2031/4835; Y; Y10; Y10S; Y10S264/00; Y10S264/52
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-03 | 1950-08-05 | 1951-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-03 | 1954-08-05 | 1955-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-03 | 1958-08-05 | 1959-02-04 | $7700.00 | Window Closed / Lapsed |