Patent US3833455A successfully refreshed from Google Patents.
US3833455A
Expired / Lapsed
US
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Multicolored etched polytetrafluoroethylene sheet
Assignee: Westinghouse Electric Corp
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Filing: 1972-08-23
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Granted: 1974-09-03
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Expires: 1992-08-23
Abstract
Abstract An etched polytetrafluoroethylene sheet is made having at least one non-white color pigmented portion and at least one unpigmented etch monitor control portion.
Inventors
- 👤 G Rosenblatt
- 👤 D Wold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
The polytetrafluoroethylene sheet of claim 1 wherein the etch monitor control portion is disposed lengthwise along an edge of the sheet and there is a definite interface between the portions of the sheet.
Claim 2
Dependent Claim
33 words
A polytetrafluoroethylene sheet having one etched side, the sheet having at least one non-white color pigmented portion comprising polytetrafluoroethylene and pigment, and at least one integral etch monitor control portion comprising unpigmented polytetrafluoroethylene.
Claim 3
Dependent Claim
23 words
The polytetrafluoroethylene sheet of claim 3 wherein the etch monitor control portion is disposed lengthwise along at least one edge of the sheet.
Claim 4
Dependent Claim
23 words
The polytetrafluoroethylene sheet of claim 3 wherein at least one etch monitor control portion is disposed between color pigmented portions of the sheet.
Claim 5
Dependent Claim
26 words
The polytetrafluoroethylene sheet of claim 3 wherein there is a definite interface between the pigmented portions of the sheet and the control portions of the sheet.
References Cited (Backward Citations)
US3115536A
Cited
US3205113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |