Patent US2937567A successfully refreshed from Google Patents.
US2937567A
Expired / Lapsed
US
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Means for determining color sensitivity
Assignee: RITTLER
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Filing: 1954-03-01
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Granted: 1960-05-24
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Expires: 1974-03-01
Abstract
No abstract record available.
Inventors
- 👤 Ferree Gertrude Rand
- 👤 Rittler Mary Catherine
- 👤 Hardy Susanna Haigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:44
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/06; A61B3/066
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) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |