US2886489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of elastase
Assignee: Armour and Co
•
Filing: 1955-10-03
•
Granted: 1959-05-12
•
Expires: 1975-10-03
Abstract
No abstract record available.
Inventors
- 👤 Norman H Grant
- 👤 Kenneth C Robbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:11
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/48; C12N9/50; C12N9/64; C12N9/6421; C12N9/6424; C12N9/6448; C12Y; C12Y304/00; C12Y304/21; C12Y304/21036; C12Y304/21037; A; A61; A61K; A61K38/00; Y; Y10; Y10S; Y10S435/00; Y10S435/814; Y10S435/815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
IN A PROCESS FOR PREPARING AN ELASTOLYTIC ENZYME SUBSTANCE, WHEREIN AN ELASTASE SUBSTANCE IS EXTRACTED FROM ELASTASE-BEARING TISSUE TO PROVIDE A CRUDE AQUEOUS CONCENTRATE THEREOF, THE STEPS OF CONTACTING A WEAK CATION EXCHANGER AND AQUEOUS CONCENTRATE OF SAID ELASTASE SUBSTANCE AT A PH OF FROM 4.5 TO 5.0 AND AN IONIC STRENGTH OF NOT MORE THAN O.4 TO PRODUCE AN ADSORBATE OF SAID OF NOT MORE THAN 0.4 TO PRODUCE AN ADSORBATE OF SAID FROM SAID ADSORBATE WITH AN AQUEOUS SALINE SOLUTION AT A PH OF FROM 4.5 TO 5.0 AND AN IONIC STRENGTH OF AT LEAST 0.4.
Claim 2
Dependent Claim
98 words
IN A PROCESS FOR PREPARING AN ELASTOLYTIC ENZYME SUBSTANCE, WHEREIN AN ELASTASE SUBSTANCE IS EXTRACTED FROM ELASTASE-BEARING TISSUE TO PROVIDE A CRUDE AQUEOUS CONCENTRATE THEREOF, THE STEPS OF CONTACTING A WEAK CATION EXCHANGER AND AQUEOUS CONCENTRATE OF SAID ELASTASE SUBSTANCE AT A PH OF FROM 4.5 TO 5.0 AND AN IONIC STRENGTH OF NOT MORE THAN O.4 TO PRODUCE AN ADSORBATE OF SAID OF NOT MORE THAN 0.4 TO PRODUCE AN ADSORBATE OF SAID FROM SAID ADSORBATE WITH AN AQUEOUS SALINE SOLUTION AT A PH OF FROM 4.5 TO 5.0 AND AN IONIC STRENGTH OF AT LEAST 0.4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |