US2572256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent urea-aldehyde type resins and method for producing the same
Assignee: Shell Development Co
•
Filing: 1948-05-17
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Granted: 1951-10-23
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Expires: 1968-05-17
Abstract
No abstract record available.
Inventors
- 👤 Garner Philip James
- 👤 Bowman Ralph Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08G12/043; C08G12/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
AN INFUSIBLE TRANSPARENT RESIN OBTAINED BY CONDENSING 50 MOL PER CENT TO 70 MOL PER CENT OF A MEMBER OF THE GROUP CONSISTING OF FORMALDEHYDE, ALDEHYDES OF THE FORMULA
Claim 2
Dependent Claim
29 words
AN INFUSIBLE TRANSPARENT RESIN OBTAINED BY CONDENSING 50 MOL PER CENT TO 70 MOL PER CENT OF A MEMBER OF THE GROUP CONSISTING OF FORMALDEHYDE, ALDEHYDES OF THE FORMULA
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) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |