US2211976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of imparting hydrophobic properties to cellulose fibers
Assignee: GAF Chemicals Corp
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Filing: 1937-09-28
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Granted: 1940-08-20
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Expires: 1957-09-28
Abstract
No abstract record available.
Inventors
- 👤 Hubert Franz Emil
- 👤 Heisenberg Erwin
- 👤 Steindorff Adolf
- 👤 Orthner Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08L; C08L1/00; D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/425; D06M13/432; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/41; D06M15/423; Y; Y10; Y10S; Y10S8/00; Y10S8/17; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907
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) | 1943-08-20 | 1944-02-19 | 1944-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-20 | 1948-02-19 | 1948-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-20 | 1952-02-19 | 1952-08-20 | $7700.00 | Window Closed / Lapsed |