Patent US2818403A successfully refreshed from Google Patents.
US2818403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl acetals of aldehydes containing a betaine group
Assignee: EIDP Inc
•
Filing: 1955-12-01
•
Granted: 1957-12-31
•
Expires: 1975-12-01
Abstract
No abstract record available.
Inventors
- 👤 Mochel Walter Edwin
- 👤 Weaver Clay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:58
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
POLYVINYL ACETALS WHICH CONTAIN SECURRING INTRALINEAR -CH2CHOH- GROUPS AND GROUPS OF THE FORMULA:
Claim 2
Dependent Claim
13 words
POLYVINYL ACETALS WHICH CONTAIN SECURRING INTRALINEAR -CH2CHOH- GROUPS AND GROUPS OF THE FORMULA:
References Cited (Backward Citations)
US2680731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |