Patent US2536676A successfully refreshed from Google Patents.
US2536676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing penicillin
Assignee: RCA Corp
•
Filing: 1946-02-21
•
Granted: 1951-01-02
•
Expires: 1966-02-21
Abstract
No abstract record available.
Inventors
- 👤 George H Brown
- 👤 Rudolph A Bierwirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:42
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/22; Y; Y10; Y10S; Y10S159/00; Y10S159/11; Y10S159/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF MAKING CRYSTALLINE PENICILLIN WHICH COMPRISES SPREADING A PREDETERMINED QUANTITY OF PENICILLIN LIQUOR INTO A THIN FILM, DIELECTRICALLY HEATING SAID THIN FILM IN A LOW PRESSURE ATMOSPHERE TO A TEMPERATURE NO HIGHER THAN 65* F. FOR A NUMBER OF MINUTES SUBSTANTIALLY EQUAL TO 5 TIMES THE NUMBER OF CUBIC CENTIMETERS IN SAID PREDETERMINED QUANTITY OF PENICILLIN LIQUOR.
Claim 2
Independent Claim
59 words
A METHOD OF MAKING CRYSTALLINE PENICILLIN WHICH COMPRISES SPREADING A PREDETERMINED QUANTITY OF PENICILLIN LIQUOR INTO A THIN FILM, DIELECTRICALLY HEATING SAID THIN FILM IN A LOW PRESSURE ATMOSPHERE TO A TEMPERATURE NO HIGHER THAN 65* F. FOR A NUMBER OF MINUTES SUBSTANTIALLY EQUAL TO 5 TIMES THE NUMBER OF CUBIC CENTIMETERS IN SAID PREDETERMINED QUANTITY OF PENICILLIN LIQUOR.
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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |