Patent EP0144434A1 successfully refreshed from Google Patents.
US2525664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting of photopolymerizable compositions
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1948-12-06
•
Granted: 1950-10-10
•
Expires: 1968-12-06
Abstract
No abstract record available.
Inventors
- 👤 John Gadsby
- 👤 Alan Leslie Laws Tompsett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/0888; B29C35/0894; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00125; B29D11/00134; B29D11/00153; B29D11/00163; B29D11/00432; B29D11/00442; B29D11/00596; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; B29K; B29K2105/00; B29K2105/0002; B29K2995/00; B29K2995/0018; B29K2995/0026; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE MANUFACTURE OF CAST SYNTHETIC RESINOUS STRUCTURES WHICH HAVE HIGH DIMENSIONAL PRECISION CONSTITUTING A SOLID OF REVOLUTION WHICH COMPRISES CONFINING A LIQUID PHOTOPOLYMERIZABLE COMPOSITION COMPRISING A PHOTOPOLYMERIZABLE MONOMERIC COMPOUND POSSESSING AT LEAST ONE >C=C< GROUP IN IN THE MOLECULE IN A MOLD HAVING INTERNAL SURFACES DEFINING SAID SOLID OF REVOLUTION, IRRADIATING SAID PHOTOPOLYMERIZABLE COMPOSITION WITH LIGHT FROM AN EXTERNAL SOURCE SUBSTANTIALLY PARALLEL TO THE AXIS OF REVOLUTION OF SAID SOLID OF REVOLUTION SO THAT THE AVERAGE QUANTITY OF LIGHT PER UNIT THICKNESS OF PHOTOPOLYMERIZABLE COMPOSITION MEASURED IN THE DIRECTION OF THE INCIDENT LIGHT, SAID THICKNESS BEING THE AVERAGE VALUE OF THE THICKNESS SO MEASURED, FALLING PER
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE MANUFACTURE OF CAST SYNTHETIC RESINOUS STRUCTURES WHICH HAVE HIGH DIMENSIONAL PRECISION CONSTITUTING A SOLID OF REVOLUTION WHICH COMPRISES CONFINING A LIQUID PHOTOPOLYMERIZABLE COMPOSITION COMPRISING A PHOTOPOLYMERIZABLE MONOMERIC COMPOUND POSSESSING AT LEAST ONE >C=C< GROUP IN IN THE MOLECULE IN A MOLD HAVING INTERNAL SURFACES DEFINING SAID SOLID OF REVOLUTION, IRRADIATING SAID PHOTOPOLYMERIZABLE COMPOSITION WITH LIGHT FROM AN EXTERNAL SOURCE SUBSTANTIALLY PARALLEL TO THE AXIS OF REVOLUTION OF SAID SOLID OF REVOLUTION SO THAT THE AVERAGE QUANTITY OF LIGHT PER UNIT THICKNESS OF PHOTOPOLYMERIZABLE COMPOSITION MEASURED IN THE DIRECTION OF THE INCIDENT LIGHT, SAID THICKNESS BEING THE AVERAGE VALUE OF THE THICKNESS SO MEASURED, FALLING PER
References Cited (Backward Citations)
US2193742A
Cited
US2367660A
Cited
US2367661A
Cited
US2425666A
Cited
US2480749A
Cited
US2480751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |