Patent FR1386750A successfully refreshed from Google Patents.
US2168778A
Expired / Lapsed
US
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Process of producing waterproof fibrous sheets
Assignee: AMERICAN BITUMULS Co
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Filing: 1936-07-31
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Granted: 1939-08-08
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Expires: 1956-07-31
Abstract
No abstract record available.
Inventors
- 👤 Montgomerie John Alexander
- 👤 Archibald Peter Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:02
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/66; D21H17/20; D21H17/21; D21H17/22; D21H17/61; D21H17/64; D21H21/00; D21H21/14; D21H21/16; D21H23/00
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) | 1942-08-07 | 1943-02-06 | 1943-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-07 | 1947-02-06 | 1947-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-07 | 1951-02-06 | 1951-08-08 | $7700.00 | Window Closed / Lapsed |