US2909442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer ribbon
Assignee: 3M Co
•
Filing: 1950-04-06
•
Granted: 1959-10-20
•
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 18:35
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1331581A
Cited
US1540862A
Cited
US1885388A
Cited
US1667689A
Cited
US1903981A
Cited
US1882593A
Cited
US1815010A
Cited
US2008763A
Cited
GB459884A
Cited
US2330353A
Cited
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 |