US2838440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dusting powder of carboxylic cationexchange resin and powder base
Assignee: Rohm and Haas Co
•
Filing: 1953-10-29
•
Granted: 1958-06-10
•
Expires: 1973-10-29
Abstract
No abstract record available.
Inventors
- 👤 Francis M Thurmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:10
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8147; A61K8/8129; A61Q; A61Q1/00; A61Q1/12; B; B01; B01J; B01J47/00; B01J47/018; A61K2800/00; A61K2800/40; A61K2800/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
AS A NEW COMPOSITION OF MATTER, A DUSTING POWDER COMPRISING 2% TO 60% BY WEIGHT OF A REFINED, FINELY PARTICLED CATION EXCHANGE RESIN AND 98% TO 40% OF A POWDER BASE, SAID RESIN HAVING CARBOXYL GROUPS AS THE REACTIVE FUNCTIONAL GROUPS THEREOF AND GIVING A PH BETWEEN ABOUT 3 AND 5.5 IN SUSPENSION IN AN AQUEOUS 0.15 N SALT SOLUTION, THE PARTICLES OF SAID RESIN SUBSTANTIALLY PASSING A 325 MESH SCREEN AND BEING DISPERSED IN SAID BASE.
Claim 2
Dependent Claim
77 words
AS A NEW COMPOSITION OF MATTER, A DUSTING POWDER COMPRISING 2% TO 60% BY WEIGHT OF A REFINED, FINELY PARTICLED CATION EXCHANGE RESIN AND 98% TO 40% OF A POWDER BASE, SAID RESIN HAVING CARBOXYL GROUPS AS THE REACTIVE FUNCTIONAL GROUPS THEREOF AND GIVING A PH BETWEEN ABOUT 3 AND 5.5 IN SUSPENSION IN AN AQUEOUS 0.15 N SALT SOLUTION, THE PARTICLES OF SAID RESIN SUBSTANTIALLY PASSING A 325 MESH SCREEN AND BEING DISPERSED IN SAID BASE.
References Cited (Backward Citations)
US2501927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |