Patent US2980973A successfully refreshed from Google Patents.
US2980973A
Expired / Lapsed
US
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Method for making lead shields
Assignee: Knapp Mills Inc
•
Filing: 1958-05-05
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Granted: 1961-04-25
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Expires: 1978-05-05
Abstract
No abstract record available.
Inventors
- 👤 Victor E Knapp
- 👤 Otto F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:10
CPC Classifications
B; B22; B22D; B22D25/00; B22D25/02; B22D25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |