Patent US2721952A successfully refreshed from Google Patents.
US2721952A
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Grid structure and the process of making
Assignee: Unisys Corp
•
Filing: 1952-05-14
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Granted: 1955-10-25
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Expires: 1972-05-14
Abstract
No abstract record available.
Inventors
- 👤 David E Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:38
CPC Classifications
H; H01; H01J; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0024; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10S428/9335; Y10S428/939; Y10T; Y10T29/00; Y10T29/49; Y10T29/49616; Y10T29/4962; Y10T29/49826; Y10T29/49888
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2169937A
Cited
US2203315A
Cited
US2157050A
Cited
US2261154A
Cited
US2296885A
Cited
US2499977A
Cited
US2515267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |