Patent US2982172A successfully refreshed from Google Patents.
US2982172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film and sound projection
Assignee: Steatit Magnesia AG
•
Filing: 1955-08-09
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Granted: 1961-05-02
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Expires: 1975-08-09
Abstract
No abstract record available.
Inventors
- 👤 Berkenhoff Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:06
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1791450A
Cited
FR695041A
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US2023770A
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US2099987A
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US2308260A
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US2243112A
Cited
US2317921A
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US2379489A
Cited
US2382116A
Cited
GB714732A
Cited
US2773416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |