So this is patent infringing code? Awful.

import scala.collection.mutable.LinkedList

class ExpiringHashTable[K, V] {

  case class Elem(key: K, var value: V, var expires: Long)

  private val BUCKETS = 10
  private val store = new Array[LinkedList[Elem]](BUCKETS)  
  for(i <- 0 until BUCKETS) store(i) = new LinkedList[Elem]

  def put(key: K, value: V, expires: Long): Unit = {
    val b = bucket(key)
    store(b).find(_.key == key) match {
      case Some(x) => {
        x.value = value
        x.expires = expires
      }
      case None => {
        store(b) = new LinkedList(Elem(key, value, expires), store(b))
      }      
    }
  }
  
  def get(key: K): Option[V] = {
    val now = System.currentTimeMillis
    var result: Option[V] = None
    
    // BUG: This doesn't handle the first element in the list being expired
    var prev: LinkedList[Elem] = null
    var i = store(bucket(key))
    while (i.next != i) {
      if (i.elem.expires < now) {
        prev.next = i.next
      } else if (i.elem.key == key) {
        result = Some(i.elem.value)
      }
      prev = i
      i = i.next
    }
    result
  }

  private def bucket(key: K) = key.hashCode % BUCKETS

}

Ya, there's a bug. Too busy ATM to think about the clean way to fix it.