Patent US2581001A successfully refreshed from Google Patents.
Patent US3397612A successfully refreshed from Google Patents.
US3397612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for photographic exposure, preferably for enlargers
Assignee: Multiblitz Mannesmann GmbH
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Filing: 1965-07-07
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Granted: 1968-08-20
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Expires: 1985-07-07
Abstract
No abstract record available.
Inventors
- 👤 Ludloff Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:02
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545; H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2331317A
Cited
US2498640A
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US2936387A
Cited
US2993144A
Cited
US3009053A
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US3174076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |