Patent US2987977A successfully refreshed from Google Patents.
US2987977A
Expired / Lapsed
US
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Plural range masking means for photographic measuring instruments
Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
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Filing: 1959-10-07
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Granted: 1961-06-13
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Expires: 1979-10-07
Abstract
No abstract record available.
Inventors
- 👤 Bretthauer Hermann
- 👤 Madge Joachim
- 👤 Kroger Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:59
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214; G02; G02B; G02B5/00; G02B5/005; G03; G03B; G03B17/00; G03B17/02; G03B17/06
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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |