US2255998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of hardened articles
Assignee: PLASKON CO Inc
•
Filing: 1938-08-09
•
Granted: 1941-09-16
•
Expires: 1958-08-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Howald
- 👤 Leonard S Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:22
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/28; C04B24/30; C04B24/307; C08; C08K; C08K3/00; C08K3/30
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) | 1944-09-15 | 1945-03-17 | 1945-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-15 | 1949-03-17 | 1949-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-15 | 1953-03-17 | 1953-09-16 | $7700.00 | Window Closed / Lapsed |