US2489640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of marking layers of material
Assignee: Michaels Stern & Co Inc
•
Filing: 1946-01-22
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Granted: 1949-11-29
•
Expires: 1966-01-22
Abstract
No abstract record available.
Inventors
- 👤 Israel E Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:27
CPC Classifications
A; A41; A41H; A41H1/00; A41H1/06; D; D06; D06H; D06H1/00; D06H1/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1363897A
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US2032047A
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US2135228A
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US2118718A
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US2231766A
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GB547481A
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US2347333A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |