Patent US3428812A successfully refreshed from Google Patents.
US3428812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical spin compensator
Assignee: National Aeronautics and Space Administration
•
Filing: 1965-10-22
•
Granted: 1969-02-18
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:59
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/64; G02B27/642; B; B64; B64G; B64G1/00; B64G1/22; G01; G01S; G01S3/00; G01S3/78; G01S3/781
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US815657A
Cited
US959013A
Cited
US1209958A
Cited
US2216031A
Cited
US2939962A
Cited
US2873381A
Cited
US3061730A
Cited
US3099748A
Cited
US3341151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |