Patent US2281157A successfully refreshed from Google Patents.
US3497157A
Expired / Lapsed
US
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Two-reel cartridges having reflecting means
Assignee: 3M Co
•
Filing: 1967-07-14
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Granted: 1970-02-24
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Expires: 1987-07-14
Abstract
No abstract record available.
Inventors
- 👤 Robert H Hanes
- 👤 Robert J Youngquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:11
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08721; G11B23/08714; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2455187A
Cited
US2661162A
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FR1094401A
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US2821576A
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US2989261A
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US3075717A
Cited
US2971716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |