US3513142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl alcohol of improved color by oxygen purge
Assignee: EIDP Inc
•
Filing: 1969-03-07
•
Granted: 1970-05-19
•
Expires: 1989-03-07
Abstract
No abstract record available.
Inventors
- 👤 Jerald A Blumberg
- 👤 Melven B Burton Jr
- 👤 Harold K Inskip
- 👤 Timothy M Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:19
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F8/00; C08F8/12; C08F8/44; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB852593A
Cited
US3248376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |