US2590402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight polymethylene terephthalate fabric produced by alkali treatment
Assignee: Imperial Chemical Industries Ltd
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Filing: 1949-08-08
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Granted: 1952-03-25
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Expires: 1969-08-08
Abstract
No abstract record available.
Inventors
- 👤 Hall John D Arcy Henry
- 👤 Ridge Bertram Pusey
- 👤 Whinfield John Rex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:40
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/38; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A PROCESS FOR PRODUCING IMPROVED LIGHT WEIGHT FABRIC COMPRISING IMMERSING A FABRIC COMPOSED OF A HIGHLY POLYMERISED POLYMETHYLENE TEREPHTHALATE HAVING 2 TO 10 INCLUSIVE CARBON ATOMS IN THE POLYMETHYLENE CHAIN WITH AN AQUEOUS SOLUTION OF AN ALKALI SELECTED FROM THE GROUP CONSISTING OF CAUSTIC SODA AND CAUSTIC POTASH WHEREBY THE WEIGHT OF THE FABRIC IS UNIFORMLY REDUCED, SAID FABRIC BEING IMMERSED IN SAID AQUEOUS SOLUTION FOR A LENGTH OF TIME SUCH THAT A THIN, LIGHTWEIGHT FABRIC IS OBTAINED
Claim 2
Dependent Claim
78 words
A PROCESS FOR PRODUCING IMPROVED LIGHT WEIGHT FABRIC COMPRISING IMMERSING A FABRIC COMPOSED OF A HIGHLY POLYMERISED POLYMETHYLENE TEREPHTHALATE HAVING 2 TO 10 INCLUSIVE CARBON ATOMS IN THE POLYMETHYLENE CHAIN WITH AN AQUEOUS SOLUTION OF AN ALKALI SELECTED FROM THE GROUP CONSISTING OF CAUSTIC SODA AND CAUSTIC POTASH WHEREBY THE WEIGHT OF THE FABRIC IS UNIFORMLY REDUCED, SAID FABRIC BEING IMMERSED IN SAID AQUEOUS SOLUTION FOR A LENGTH OF TIME SUCH THAT A THIN, LIGHTWEIGHT FABRIC IS OBTAINED
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |