Patent US2845659A successfully refreshed from Google Patents.
US2845659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of foam rubber
Assignee: Dunlop Rubber Co Ltd
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Filing: 1955-10-24
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Granted: 1958-08-05
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Expires: 1975-10-24
Abstract
No abstract record available.
Inventors
- 👤 Calvert Kenneth Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:28
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08L; C08L21/00; C08J2321/00; C08J2321/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD OF MAKING FOAM RUBBER WHICH COMPRISES FOAMING A VULCANIZABLE COMPOUNDED RUBBER LATEX, SHAPING SAID FOAMED LATEX, GELLING SAID SHAPED FOAMED LATEX BY MEANS OF A NON-GASEOUS GELLING AGENT, TREATING SAID GELLED, FOAMED LATEX WITH A COAGULATING GAS AND VULCANIZING SAID TREATED FOAMED LATEX.
Claim 2
Independent Claim
45 words
A METHOD OF MAKING FOAM RUBBER WHICH COMPRISES FOAMING A VULCANIZABLE COMPOUNDED RUBBER LATEX, SHAPING SAID FOAMED LATEX, GELLING SAID SHAPED FOAMED LATEX BY MEANS OF A NON-GASEOUS GELLING AGENT, TREATING SAID GELLED, FOAMED LATEX WITH A COAGULATING GAS AND VULCANIZING SAID TREATED FOAMED LATEX.
References Cited (Backward Citations)
US2346055A
Cited
US2640036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |