Patent US3280235A successfully refreshed from Google Patents.
US3280235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reducing block in polymer films
Assignee: Dow Chemical Co
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Filing: 1964-06-05
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Granted: 1966-10-18
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Expires: 1984-06-05
Abstract
No abstract record available.
Inventors
- 👤 Gaylon L Dighton
- 👤 Nash A Kidd
- 👤 Jack R Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:23
CPC Classifications
C; C08; C08J; C08J5/00; D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0019; B29C48/03; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A PROCESS FOR PRODUCING THERMOPLASTIC FILM BY EXTRUDING A THERMOPLASTIC FILM-FORMING MATERIAL TO FORM A PLASTIC TUBING, INFLATING THE TUBING WITH A GASEOUS INFLATING AGENT TO FORM A PLASTIC BUBBLE, COOLING AND THEREAFTER COLLAPSING THE BUBBLE AND COLLECTING THE FILM, THE IMPROVEMENT WHICH COMPRISES ADMIXING WITH THE THERMOPLASTIC FILM-FORMING MATERIAL BEFORE EXTRUSION A MINOR PROPORTION OF A SATURATED ALIPHATIC MONOCARBOXYLIC ACID HAVING FROM 12 TO 22 CARBON ATOMS PER MOLECULE, EXTRUDING THE RESULTING THERMOPLASTIC MIXTURE AT AN EVELATED TEMPERATURE TO FORM A SEAMLESS PLASTIC TUBING, INFLATING SAID TUBING WITH A GASEOUS INFLATING AGENT, SAID INFLATING AGENT CONTAINING A REAGENT REACTING WITH THE REACTIVE GROUPS OF THE MONOCARBOXYLIC ACID ON THE INSIDE SURFACE OF THE RESULTING BLOWN PLASTIC BUBBLE, COOLING AND COLLAPSING THE BLOWN BUBBLE BY CONSTRICTING MEANS, AND COLLECTING THE RESULTING FILM.
Claim 2
Dependent Claim
133 words
IN A PROCESS FOR PRODUCING THERMOPLASTIC FILM BY EXTRUDING A THERMOPLASTIC FILM-FORMING MATERIAL TO FORM A PLASTIC TUBING, INFLATING THE TUBING WITH A GASEOUS INFLATING AGENT TO FORM A PLASTIC BUBBLE, COOLING AND THEREAFTER COLLAPSING THE BUBBLE AND COLLECTING THE FILM, THE IMPROVEMENT WHICH COMPRISES ADMIXING WITH THE THERMOPLASTIC FILM-FORMING MATERIAL BEFORE EXTRUSION A MINOR PROPORTION OF A SATURATED ALIPHATIC MONOCARBOXYLIC ACID HAVING FROM 12 TO 22 CARBON ATOMS PER MOLECULE, EXTRUDING THE RESULTING THERMOPLASTIC MIXTURE AT AN EVELATED TEMPERATURE TO FORM A SEAMLESS PLASTIC TUBING, INFLATING SAID TUBING WITH A GASEOUS INFLATING AGENT, SAID INFLATING AGENT CONTAINING A REAGENT REACTING WITH THE REACTIVE GROUPS OF THE MONOCARBOXYLIC ACID ON THE INSIDE SURFACE OF THE RESULTING BLOWN PLASTIC BUBBLE, COOLING AND COLLAPSING THE BLOWN BUBBLE BY CONSTRICTING MEANS, AND COLLECTING THE RESULTING FILM.
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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |