Patent US2220389A successfully refreshed from Google Patents.
US2220389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collimator
Assignee: Individual
•
Filing: 1937-07-07
•
Granted: 1940-11-05
•
Expires: 1957-07-07
Abstract
No abstract record available.
Inventors
- 👤 Berg Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:40
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/12; G02B5/126; E; E01; E01F; E01F9/00; E01F9/60; E01F9/658; E01F9/669; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49917; Y10T29/49918
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) | 1943-11-05 | 1944-05-06 | 1944-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-05 | 1948-05-06 | 1948-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-05 | 1952-05-06 | 1952-11-05 | $7700.00 | Window Closed / Lapsed |