Patent US2923977A successfully refreshed from Google Patents.
US2923977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the electrical characteristics
Assignee: —
•
Filing: —
•
Granted: 1960-02-09
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Expires: 1977-02-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:31
CPC Classifications
B; B29; B29D; B29D7/00; B29C; B29C71/00; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR THE IMPROVEMENT OF ELECTRICAL CHARACTERISTICS OF POLYETHYLENE TEREPHTHALATE FILM COMPRISING THE STEPS OF TREATING A FILM CONTAINING A HIGH MOLECULAR WEIGHT CONSTITUENT OF POLYETHYLENE TEREPHTHALATE AND A CYCLIC TRIMER OF ETHYLENE TEREPHTHALATE WITH A SOLVENT FOR SAID TRIMER, EXTRACTING THE CYCLIC TRIMER OF ETHYLENE TEREPHTHALATE FROM THE SURFACE OF SAID FILM, RINSING SAID IMMERSED AND EXTRACTED FILM IN AIR AND SUBSEQUENTLY VACUUM REDUCED CONCENTRATION OF TRIMER OF ETHYLENE TEREPHTHALATE, HEATING SAID RINSED FILM IN AIR AND SUBSEQUENTLY VACUUM DRYING SAILD FILM, THUS FORMING A SURFACE OF SAID FILM SUBSTANTIALLY FREE FROM SAID CYCLIC TRIMER.
Claim 2
Dependent Claim
97 words
A PROCESS FOR THE IMPROVEMENT OF ELECTRICAL CHARACTERISTICS OF POLYETHYLENE TEREPHTHALATE FILM COMPRISING THE STEPS OF TREATING A FILM CONTAINING A HIGH MOLECULAR WEIGHT CONSTITUENT OF POLYETHYLENE TEREPHTHALATE AND A CYCLIC TRIMER OF ETHYLENE TEREPHTHALATE WITH A SOLVENT FOR SAID TRIMER, EXTRACTING THE CYCLIC TRIMER OF ETHYLENE TEREPHTHALATE FROM THE SURFACE OF SAID FILM, RINSING SAID IMMERSED AND EXTRACTED FILM IN AIR AND SUBSEQUENTLY VACUUM REDUCED CONCENTRATION OF TRIMER OF ETHYLENE TEREPHTHALATE, HEATING SAID RINSED FILM IN AIR AND SUBSEQUENTLY VACUUM DRYING SAILD FILM, THUS FORMING A SURFACE OF SAID FILM SUBSTANTIALLY FREE FROM SAID CYCLIC TRIMER.
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) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |