US2296972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated chart paper and method of making same
Assignee: Sangamo Electric Co
•
Filing: 1940-04-22
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Granted: 1942-09-29
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Expires: 1960-04-22
Abstract
No abstract record available.
Inventors
- 👤 Earl C Alkire
- 👤 Emil F Blase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/18; D21H23/00; D21H23/02; D21H23/22; D21H5/00; D21H5/0005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-09-28 | 1946-03-30 | 1946-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-09-28 | 1950-03-30 | 1950-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-09-28 | 1954-03-30 | 1954-09-29 | $7700.00 | Window Closed / Lapsed |