US2308692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Greaseproof paper
Assignee: Dow Chemical Co
•
Filing: 1941-03-06
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Granted: 1943-01-19
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Expires: 1961-03-06
Abstract
No abstract record available.
Inventors
- 👤 Richard D Freeman
- 👤 Floyd C Peterson
- 👤 Jr George K Greminger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:10
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/34
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) | 1946-01-18 | 1946-07-20 | 1947-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-01-18 | 1950-07-20 | 1951-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-01-18 | 1954-07-20 | 1955-01-19 | $7700.00 | Window Closed / Lapsed |