US2735840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum pump
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
•
Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:11
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S264/00; Y10S264/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF HIGH MOLECULAR WEIGHT FIBER-FORMING SYNTHETIC LINEAR POLYAMIDES BY HEATING RELATIVELY LOW MOLECULAR WEIGHT MONOMERIC LACTAMS WHICH COMPRISES HEATING SUCH A MONOMERIC LACTAM TO BE POLYMERIZED IN THE MOLTEN STATE WHILE FLOWING THROUGH AN ELONGATED SPIRAL SUBSTANTIALLY HORIZONTAL POLYMERIZATION ZONE OF GREAT LENGTH AS COMPARED TO ITS HEIGHT WHILE IN THE FORM OF A CONTINUOUSLY FLOWING UNINTERRUPTED LAYER OF LIQUID HAVING AN UNCONFINED UPPER SURFACE, AND UNDER CONDITIONS SUCH AS TO EFFECT POLYMERIZATION OF SAID MONOMERIC LACTAM, PASSING THE POLYMERIZED MATERIAL FROM THE POLYMERIZATION ZONE INTO A DISCHARGE ZONE THROUGH A COMMUNICATING FLUID SEALING ZONE IN WHICH IS MAINTAINED AT ALL TIMES A SUBSTANTIAL QUANTITY OF THE POLY-
Claim 2
Dependent Claim
114 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF HIGH MOLECULAR WEIGHT FIBER-FORMING SYNTHETIC LINEAR POLYAMIDES BY HEATING RELATIVELY LOW MOLECULAR WEIGHT MONOMERIC LACTAMS WHICH COMPRISES HEATING SUCH A MONOMERIC LACTAM TO BE POLYMERIZED IN THE MOLTEN STATE WHILE FLOWING THROUGH AN ELONGATED SPIRAL SUBSTANTIALLY HORIZONTAL POLYMERIZATION ZONE OF GREAT LENGTH AS COMPARED TO ITS HEIGHT WHILE IN THE FORM OF A CONTINUOUSLY FLOWING UNINTERRUPTED LAYER OF LIQUID HAVING AN UNCONFINED UPPER SURFACE, AND UNDER CONDITIONS SUCH AS TO EFFECT POLYMERIZATION OF SAID MONOMERIC LACTAM, PASSING THE POLYMERIZED MATERIAL FROM THE POLYMERIZATION ZONE INTO A DISCHARGE ZONE THROUGH A COMMUNICATING FLUID SEALING ZONE IN WHICH IS MAINTAINED AT ALL TIMES A SUBSTANTIAL QUANTITY OF THE POLY-
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) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |