US2540962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polytetrahaloethylene films
Assignee: Sprague Electric Co
•
Filing: 1948-11-16
•
Granted: 1951-02-06
•
Expires: 1968-11-16
Abstract
No abstract record available.
Inventors
- 👤 Henry F Puppolo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR PRODUCING FILMS OF POLYTETRAHALOETHYLENE RESINS LESS THAN 0.0001 INCH THICK, WHICH PROCESS COMPRISES DEPOSITING A MIXTURE OF POLYTETRAHALOETHYLENE RESIN PARTICLES LESS THAN 50 MICRONS IN DIAMETER AND A VOLATILIZABLE LIQUID COMPOUND CONTAINING A HYDROXY GROUP UPON A SMOOTH SURFACE OF A SHEET OF METAL SELECTED FROM THE CLASS CONSISTING OF IRON AND COPPER, HEATING THE METAL SURFACE AND THE MIXTURE DEPOSITED THEREON TO A TEMPERATURE BETWEEN ABOUT 300* C. AND ABOUT 400* C. FOR AT LEAST ABOUT 5 SECONDS TOO SINTER THE RESIN PARTICLES TOGETHER, COOLING THEM, AND THEN STRIPPING OFF FROM THE UNDERLYING METAL SURFACE THE FILM OF SINTERED RESIN PARTICLES SO FORMED.
Claim 2
Dependent Claim
107 words
A PROCESS FOR PRODUCING FILMS OF POLYTETRAHALOETHYLENE RESINS LESS THAN 0.0001 INCH THICK, WHICH PROCESS COMPRISES DEPOSITING A MIXTURE OF POLYTETRAHALOETHYLENE RESIN PARTICLES LESS THAN 50 MICRONS IN DIAMETER AND A VOLATILIZABLE LIQUID COMPOUND CONTAINING A HYDROXY GROUP UPON A SMOOTH SURFACE OF A SHEET OF METAL SELECTED FROM THE CLASS CONSISTING OF IRON AND COPPER, HEATING THE METAL SURFACE AND THE MIXTURE DEPOSITED THEREON TO A TEMPERATURE BETWEEN ABOUT 300* C. AND ABOUT 400* C. FOR AT LEAST ABOUT 5 SECONDS TOO SINTER THE RESIN PARTICLES TOGETHER, COOLING THEM, AND THEN STRIPPING OFF FROM THE UNDERLYING METAL SURFACE THE FILM OF SINTERED RESIN PARTICLES SO FORMED.
References Cited (Backward Citations)
US2440190A
Cited
US2442940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |