US2930281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photometers, more particularly photographic exposure meters
Assignee: Daystrom Inc
•
Filing: 1955-02-25
•
Granted: 1960-03-29
•
Expires: 1975-02-25
Abstract
No abstract record available.
Inventors
- 👤 Dunn John Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:32
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1840500A
Cited
US2143500A
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US2206196A
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US2214283A
Cited
US2503768A
Cited
DE888802C
Cited
US2509366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |