US2442910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic comparator densitometer
Assignee: PHOTOSWITCH Inc
•
Filing: 1944-06-24
•
Granted: 1948-06-08
•
Expires: 1964-06-24
Abstract
No abstract record available.
Inventors
- 👤 Thomson Elihu Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:20
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1932337A
Cited
US1881336A
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DE636170C
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US2032128A
Cited
US2066934A
Cited
US2240722A
Cited
US2324270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |