Patent US3520073A successfully refreshed from Google Patents.
US3520073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifunction astronomical display planetarium
Assignee: Individual
•
Filing: 1968-11-04
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Granted: 1970-07-14
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Expires: 1988-11-04
Abstract
No abstract record available.
Inventors
- 👤 Klaus Baader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:50
CPC Classifications
G; G09; G09B; G09B27/00; G09B27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE353679C
Cited
US1770820A
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US2112314A
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US2379468A
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US2358075A
Cited
US3050888A
Cited
US3303582A
Cited
US3292287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |