US3766031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for non-destructive radiation degradation of polytetrafluoroethylene
Assignee: Garlock Inc
•
Filing: 1972-04-10
•
Granted: 1973-10-16
•
Expires: 1992-04-10
Abstract
Abstract Solid polytetrafluoroethylene, sintered or unsintered, is degraded non-destructively by irradiation at a dosage level in the range of from about 5 megarads to about 25 megarads. The irradiated polytetrafluoroethylene is readily comminuted and exhibits the characteristic low coefficeint of friction of polytetrafluoroethylene.
Inventors
- 👤 J Dillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:03
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F8/00; C08F8/50; C08J3/28; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
7 words
comminuting the product of step (1), and
Claim 2
Dependent Claim
22 words
The process of claim 1 wherein the dosage level is within the range of from about 10 megarads to about 25 megarads.
Claim 3
Dependent Claim
8 words
The product of the process of claim 1.
Claim 4
Dependent Claim
20 words
recovering as a product microfine polytetrafluoroethylene which has a coefficient of friction in the range of from 0.04 to 0.15.
References Cited (Backward Citations)
GB829503A
Cited
US2936301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |