Patent US2893877A successfully refreshed from Google Patents.
US2767436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of forming smooth surfaces on thermoplastic sponge
Assignee: Sanders SA
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Filing: 1952-08-25
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Granted: 1956-10-23
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Expires: 1972-08-25
Abstract
No abstract record available.
Inventors
- 👤 Robert L Noland
- 👤 Victor M Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:47
CPC Classifications
A; A63; A63H; A63H27/00; A63H27/02; B; B29; B29C; B29C44/00; B29C44/02; B29C44/10; B29C44/34; B29C44/56; B29C44/5627; B29C44/5636; B29L; B29L2031/00; B29L2031/52; B29L2031/5209; B29L2031/5218; B29L2031/712; B29L2031/7132; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10S264/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD OF FORMING ARTICLES FROM A BLAND OF THERMOPLASTIC SPONGE MATERIAL WHICH CONSISTS IN HEATING TO A TEMPERATURE EXCEEDING THE SOFTENING TEMPERATURE OF SAID MATERIAL A SEPARABLE DIE DEFINING WHEN CLOSED A DIE CAVITY CONFORMING IN SHAPE TO THE SHAPE OF SAID ARTICLE, PLACING SAID BLANK IN SAID CAVITY, SAID BLANK HAVING A SHAPE GENERALLY SIMILAR TO THE SHAPE OF SAID CAVITY AND HAVING A VOLUME SUBSTANTIALLY EQUAL OF THE VOLUME OF SAID CAVITY, APPLYING TO SAID DIE A CLOSING FORCE LESS THAN THAT REQUIRED TO EXCEED THE COMPRESSIVE STRENGTH OF SAID MATERIAL AT AMBIENT TEMPERATURES AND MAINTAINING SAID CLOSING FORCE UNTIL SAID DIE IS CLOSED, IMMEDIATELY COOLING SAID DIE TO A TEMPERATURE LESS THAN SAID SOFTENING TEMPERATURE, AND THEN OPENING SAID DIE AND REMOVING SAID ARTICLE THEREFROM.
Claim 2
Independent Claim
129 words
THE METHOD OF FORMING ARTICLES FROM A BLAND OF THERMOPLASTIC SPONGE MATERIAL WHICH CONSISTS IN HEATING TO A TEMPERATURE EXCEEDING THE SOFTENING TEMPERATURE OF SAID MATERIAL A SEPARABLE DIE DEFINING WHEN CLOSED A DIE CAVITY CONFORMING IN SHAPE TO THE SHAPE OF SAID ARTICLE, PLACING SAID BLANK IN SAID CAVITY, SAID BLANK HAVING A SHAPE GENERALLY SIMILAR TO THE SHAPE OF SAID CAVITY AND HAVING A VOLUME SUBSTANTIALLY EQUAL OF THE VOLUME OF SAID CAVITY, APPLYING TO SAID DIE A CLOSING FORCE LESS THAN THAT REQUIRED TO EXCEED THE COMPRESSIVE STRENGTH OF SAID MATERIAL AT AMBIENT TEMPERATURES AND MAINTAINING SAID CLOSING FORCE UNTIL SAID DIE IS CLOSED, IMMEDIATELY COOLING SAID DIE TO A TEMPERATURE LESS THAN SAID SOFTENING TEMPERATURE, AND THEN OPENING SAID DIE AND REMOVING SAID ARTICLE THEREFROM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |