US2583772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid and quaternary salts of polyamides
Assignee: Dearborn Chemical Co
•
Filing: 1949-02-12
•
Granted: 1952-01-29
•
Expires: 1969-02-12
Abstract
No abstract record available.
Inventors
- 👤 Lewis O Gunderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:30
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/405
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
US2008649A
Cited
US1924698A
Cited
US2259650A
Cited
US2425392A
Cited
US2357598A
Cited
US2468086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-28 | 1955-07-30 | 1956-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-28 | 1959-07-30 | 1960-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-28 | 1963-07-30 | 1964-01-29 | $7700.00 | Window Closed / Lapsed |