Patent US3490839A successfully refreshed from Google Patents.
US3490839A
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Assignee: 3M Co
•
Filing: 1967-11-15
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Granted: 1970-01-20
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Expires: 1987-11-15
Abstract
No abstract record available.
Inventors
- 👤 Richard D Hipp Jr
- 👤 Lyle B La Core
- 👤 Roger H Appeldorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:30
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/08; G02B19/00; G02B19/0004; G02B19/0028; G02B19/0033; G02B19/0047; G03; G03B; G03B23/00; G03B23/02; G03B23/04; G03B23/044; Y; Y10; Y10S; Y10S353/00; Y10S353/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2907128A
Cited
US3072016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |