The Beneficial Standard Life Insurance Company (Los Angeles, CA) operated from 1947 until 2008, when it was declared insolvent and placed into liquidation by the California Insurance Commissioner.
The liquidation process concluded in 2011, at which point the Commissioner confirmed that all policyholder claims had been paid in full. The company no longer exists as a going concern; its policies were either assumed by other insurers or settled through the California Life & Health Insurance Guarantee Association.
If you hold an old policy document, contact the California Department of Insurance for guidance on any residual claims.