US2177580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of coating paper
Assignee: Warren SD Co
•
Filing: 1937-01-04
•
Granted: 1939-10-24
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Expires: 1957-01-04
Abstract
No abstract record available.
Inventors
- 👤 Laurence W Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:04
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/52; D21H23/56; D21H19/00; D21H19/80; D21H19/82; D21H19/822; D21H5/00; D21H5/0005; D21H5/0025; D21H5/003
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) | 1942-10-23 | 1943-04-24 | 1943-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-23 | 1947-04-24 | 1947-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-23 | 1951-04-24 | 1951-10-24 | $7700.00 | Window Closed / Lapsed |