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Patent US2909442A successfully refreshed from Google Patents.
US2909442A
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Assignee: 3M Co
•
Filing: 1950-04-06
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Granted: 1959-10-20
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Expires: 1970-04-06
Abstract
No abstract record available.
Inventors
- 👤 Andrew H Persoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:54
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/633; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2848; Y10T428/2852; Y10T428/2878; Y10T428/2891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1882593A
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US2008763A
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GB459884A
Cited
US2330353A
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US2353717A
Cited
US2556078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |