US3520820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold water dispersible emulsions of filming amines
Assignee: WR Grace and Co
•
Filing: 1968-01-29
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Granted: 1970-07-21
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Expires: 1988-01-29
Abstract
No abstract record available.
Inventors
- 👤 Chih Ming Hwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:32
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/46; D06M13/463; B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/0043; B03D1/01; B03D1/011; C; C09; C09K; C09K23/00; C09K23/16; C11; C11D; C11D1/00; C11D1/38; C11D1/40; C11D3/00; C11D3/16; C11D3/26; C11D3/30; C23; C23F; C23F11/00; C23F11/08; C23F11/10; D06M13/325; D06M13/368; D06M13/372; D06M13/467; B03D2201/00; B03D2201/007; D06M2200/00; D06M2200/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |