Patent US2706309A successfully refreshed from Google Patents.
US2706309A
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US
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Means of forming patterns and molds
Assignee: Northrop Grumman Corp
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Filing: 1952-03-17
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Granted: 1955-04-19
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Expires: 1972-03-17
Abstract
No abstract record available.
Inventors
- 👤 James A Lampman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:25
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/28; B29C43/00; B29C43/02; B29C43/10; B29C43/12; Y; Y10; Y10S; Y10S425/00; Y10S425/019; Y10S425/029
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) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |