Patent US3507547A successfully refreshed from Google Patents.
US3507547A
Expired / Lapsed
US
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Telescope having multiple objective mirrors
Assignee: WARREN R THOMAS
•
Filing: 1965-10-12
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Granted: 1970-04-21
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Expires: 1985-10-12
Abstract
No abstract record available.
Inventors
- 👤 Warren R Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
G; G02; G02B; G02B23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1640694A
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US1921630A
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US2409186A
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US2413286A
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US2934995A
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US2987961A
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US3173012A
Cited
US3325238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |