US3045934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface hardening for hammermill hammers
Assignee: Paper Calmenson and Co
•
Filing: 1961-08-18
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Granted: 1962-07-24
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Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
- 👤 Howard F Eilers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:27
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/28; B28; B28D; B28D1/00; B28D1/02; B28D1/12; B28D1/127; Y; Y10; Y10T; Y10T407/00; Y10T407/26
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) | 1965-07-23 | 1966-01-22 | 1966-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-23 | 1970-01-22 | 1970-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-23 | 1974-01-22 | 1974-07-24 | $7700.00 | Window Closed / Lapsed |