US2617149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming sheets from perfluorochlorocarbon plastic
Assignee: MW Kellogg Co
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Filing: 1949-12-31
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Granted: 1952-11-11
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Expires: 1969-12-31
Abstract
No abstract record available.
Inventors
- 👤 Louis C Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/0288; B29C43/00; B29C43/02; B29K; B29K2027/00; B29K2027/12; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD FOR FORMING SHEETS WITHOUT A DIE FROM A THERMOPLASTIC POLYMER OF TRIFLUOROCHLOROETHYLENE WHICH COMPRISES PLACING THE PLASTIC BETWEEN PRESSING PLATENS CONTAINING A GAUGE BLOCK, COMPRESSING SAID PLASTIC BETWEEN SAID PRESSING PLATENS UNDER SUFFICIENT ELEVATED PRESSURE TO CLOSE SAID PLATENS AGAINST SAID GAUGE BLOCK AT AN ELEVATED TEMPERATURE SUFFICIENT TO MOLD SAID PLASTIC INTO A SHEET, AFTER CLOSING SAID PLATENS AGAINST SAID GAUGE BLOCK TO FORM THE MOLDED SHEET MAINTAINING THE ELEVATED TEMPERATURE AND PRESSURE AT LEAST UNTIL A COLOR CHANGE INDICATIVE OF PLASTIFICATION IS NOTED, AND THEREAFTER COOLING SAID MOLDED SHEET.
Claim 2
Independent Claim
93 words
A METHOD FOR FORMING SHEETS WITHOUT A DIE FROM A THERMOPLASTIC POLYMER OF TRIFLUOROCHLOROETHYLENE WHICH COMPRISES PLACING THE PLASTIC BETWEEN PRESSING PLATENS CONTAINING A GAUGE BLOCK, COMPRESSING SAID PLASTIC BETWEEN SAID PRESSING PLATENS UNDER SUFFICIENT ELEVATED PRESSURE TO CLOSE SAID PLATENS AGAINST SAID GAUGE BLOCK AT AN ELEVATED TEMPERATURE SUFFICIENT TO MOLD SAID PLASTIC INTO A SHEET, AFTER CLOSING SAID PLATENS AGAINST SAID GAUGE BLOCK TO FORM THE MOLDED SHEET MAINTAINING THE ELEVATED TEMPERATURE AND PRESSURE AT LEAST UNTIL A COLOR CHANGE INDICATIVE OF PLASTIFICATION IS NOTED, AND THEREAFTER COOLING SAID MOLDED SHEET.
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) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |