Patent US2728944A successfully refreshed from Google Patents.
US2728944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of artificial films
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1953-01-19
•
Granted: 1956-01-03
•
Expires: 1973-01-19
Abstract
No abstract record available.
Inventors
- 👤 Crooks Charles Hampden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/919; B29C48/03; B29C48/07; B29C48/08; B29C48/911; B29C48/9135; B29C48/914; B29C48/001; B29C48/0018
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
APPARATUS FOR THE PRODUCTION OF MELT-EXTRUDED FILM WHICH COMPRISES A PAIR OF CONTRA-ROTATABLE NIP ROLLS, MEANS FOR EXTRUDING A MOLTEN FILM DOWNWARDS INTO THE NIP OF THE ROLLS, MEANS FOR SUPPLYING LIQUID TO THE NIP AND FOR MAINTAINING A POOL AT EACH SIDE OF THE FOR REMOVING LIQUID FOR THE POOL AT EACH SIDE OF THE PATH OF THE FILM SAID MEANS BEING IN THE REGIONS DIRECTLY BETWEEN THE PATH OF THE FILM AND THE NIP ROLLS.
Claim 2
Dependent Claim
77 words
APPARATUS FOR THE PRODUCTION OF MELT-EXTRUDED FILM WHICH COMPRISES A PAIR OF CONTRA-ROTATABLE NIP ROLLS, MEANS FOR EXTRUDING A MOLTEN FILM DOWNWARDS INTO THE NIP OF THE ROLLS, MEANS FOR SUPPLYING LIQUID TO THE NIP AND FOR MAINTAINING A POOL AT EACH SIDE OF THE FOR REMOVING LIQUID FOR THE POOL AT EACH SIDE OF THE PATH OF THE FILM SAID MEANS BEING IN THE REGIONS DIRECTLY BETWEEN THE PATH OF THE FILM AND THE NIP ROLLS.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |