US4281980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion deformable extrusion die blade
Assignee: Solutia Inc
•
Filing: 1980-01-18
•
Granted: 1981-08-04
•
Expires: 2000-01-18
Abstract
Abstract A flexible lip die blade is provided in which local flexing of the blade is brought about by activation of heaters located in connector members connecting the flexible lip with the body of the die blade.
Inventors
- 👤 John C. Hoagland
- 👤 Peter H. Farmer
- 👤 Rocco M. Carabetta, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:57
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/35; B29C48/305; B29C48/31; B29C48/313; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92609; B29C2948/92647; B29C2948/92819; B29C2948/92857; B29C2948/92904; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
An integrally formed die blade having a body portion, a flexible lip portion and a plurality of elongated connector members each having one end rigidly connected to the body portion of the die blade and the other rigidly connected to the flexible lip and at least some of the said connector members being provided with heater elements such that activation of any such heater element produces expansion of the connector member and a resultant local deformation of the flexible die lip in the region of the expanded connector member.
Claim 2
Dependent Claim
89 words
An integrally formed die blade having a body portion, a flexible lip portion and a plurality of elongated connector members each having one end rigidly connected to the body portion of the die blade and the other rigidly connected to the flexible lip and at least some of the said connector members being provided with heater elements such that activation of any such heater element produces expansion of the connector member and a resultant local deformation of the flexible die lip in the region of the expanded connector member.
Claim 3
Dependent Claim
43 words
A die blade according to claim 1 in which the connector members are provided by the cross-members of a plate having a ladder configuration the longitudinal members of which are rigidly attached, one to the die body and one to the flexible lip.
Claim 4
Dependent Claim
56 words
A die blade according to claim 2 in which the connector members are fabricated from a material with a thermal conductivity that is not greater than 29.3 kg. cal/sec/cm 2 . °C., a coefficient of thermal expansion of at least 10.8 cm/cm °C. and a modulus of elasticity of at least 1.75×10 6 kg/cm 2 .
Claim 5
Dependent Claim
35 words
A die blade according to either of claims 2 or 3 in which a rigid insulating material is interposed between the connecting members and the portions of the die blade to which they are bolted.
Claim 6
Dependent Claim
36 words
A die blade according to either of claims 2 or 3 in which a cover member is attached to the die blade such that the connector members lie between the cover member and the die blade.
Claim 7
Dependent Claim
44 words
A die blade according to either of claims 2 or 3 in which a heat barrier means is provided in the flexible lip portion for maintaining the temperature of the lip substantially independent of temperature variations in the connector members and the body portion.
References Cited (Backward Citations)
US2938231A
Cited
US3261893A
Cited
US3767346A
Cited
US3985845A
Cited
US3940221A
Cited
US3940221B1
Cited
US4003689A
Cited
US4125350A
Cited
US4055389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |